Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfcb87461efeb90…

MALICIOUS

PDF

87.5 KB Created: 2021-04-04 23:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1f47c2caec17b68f113332d01a24aa60 SHA-1: ef05187953c1d783916d124e6a350286050b1979 SHA-256: 9bfcb87461efeb90ff44ee8342edd07576bd701e8efd2229185490c0b6903149
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to financial analysis, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=company+financial+analysis+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_603af667444d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_60519d7648d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_602cf9ba37ed7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5fe56103595cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_6041ebd75b86f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fokapikow/kibilotujeganivigusa.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/a5_envelope_template.pdfIn PDF document text
    • http://bitibidebizofu.epizy.com/lalisuzipu.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/whatsapp_for_nokia_lumia_530.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_941daf53c00845a3b9ed827fd1c25956.pdf?index=trueIn PDF document text
    • http://wuvodubox.epizy.com/bright_starts_ingenuity_cradle_and_sway_swing_bella_vista.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/what_makes_a_good_hook_in_writing.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_5ed6d6eaebef49668df07f44acbb43b6.pdf?index=trueIn PDF document text
    • http://bezalilanele.rf.gd/94910858405.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/46782585213.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/sumunuvoxuboluwijilitoso.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/aetna_insurance_dubai_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/division_with_remainders_worksheets_4th_grade.pdfIn PDF document text
    • http://vaduxovogemuke.epizy.com/gelizizugelirudora.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/zesapuxepadifukepemediso.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_cca2680ce4b6490c8fdeadad57f87a6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvetaso/english_idioms_list.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 4920 bytes
SHA-256: 7a605556f3825f76a17eabd35204601977d16e4f0eb762d3ebd0c3946b08fcd8
font_01_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10924 bytes
SHA-256: 3dd527f1d7db7f006eecda5c29a26a43705aa2237f92a55782b26c696497ad6f
font_02_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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