Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba051a3a642c540…

MALICIOUS

PDF

92.8 KB Created: 2021-05-04 10:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ba5f2855bc66416584a043d7b5269c49 SHA-1: 7b349b984afee65e74f5d2b6bd53c20d38383714 SHA-256: 8ba051a3a642c540c7be98e9d87517114dba17f27956cbcbcded2727982b1f0a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content is designed to trick users into changing payment details. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=accounting+journal+entries+questions+with+answers PDF link annotation
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/8226d79afd.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/jgOO1Ta/13750037085.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/2468795.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/djcQxLp/76168424282.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/fxhr4hd/skyrim_dragonbone_arrow_id.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/pafubivapalo.pdfIn PDF document text
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/jadegilo-zodowez.pdfIn PDF document text
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/4732048.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/wamokodorogo_vetixusudevu_sipuvowogim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5feccbe7371d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530578/normal_6003266133cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6048fbbfe62e7.pdfIn PDF document text
    • https://gepulepefuxogu.weebly.com/uploads/1/3/2/6/132683228/pezajux_riros_wazebelexemofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/some_emotional_status_for_whatsapp.pdfIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_88a5fa1b4be7476d893fd7ffd27fb103.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_7dcef506408049dd93b3204d53b7773e.pdf?index=trueIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_adf9fb0d08dd419ead9392f2af0bf9a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/aprende_ingles_mientras_duermes_mp3_gratis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 5344 bytes
SHA-256: 249cf1c50f610f6583e20efea7a367e4947102dc4770ee31cb79050f57f38970
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 3852 bytes
SHA-256: bec7a4ef2b6abc0f8b4d5cd61dcb85e73abff0d238454ecaed4d8568c9b8f0d0
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 2800 bytes
SHA-256: d830524a08b45400cdda3ccce7a51876f4b1214257042f9d635777c44924126f
font_03_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 12400 bytes
SHA-256: a9ac051fe9d3e2716e169b78dde20f8cf6456b995636dd5fb268d53dacdc6fda
font_04_sfnt_off00013ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_05_sfnt_off0001542d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542D 4252 bytes
SHA-256: 57e6928538eac7e8b4c0d3b8d02f72394b158827c7cd0dc3f1b7bee62ffe748c

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