Malicious PDF — malware analysis report

Static analysis result for SHA-256 db94c505121dd9a0…

MALICIOUS

PDF

87.5 KB Created: 2021-03-23 22:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3bb3623d32fc6058e3d9300ee59c3357 SHA-1: 04a860e3fbd17b75f7d78e4e9dc0c98a51105c26 SHA-256: db94c505121dd9a0985b4a741fe1d121d94b18c7e48d88744715601951e1a672
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://pelibifir.ru/123?utm_term=nsou+pg+assignment+front+page+pdf PDF link annotation
    • http://kibatol.22web.org/aircraft_structures_for_engineering_students_thg_megson.pdfIn PDF document text
    • http://sayseedokg.com/cmos_analog_vlsi_designlj4ip.pdfIn PDF document text
    • http://keep-travel.com/690028241481n37e.pdfIn PDF document text
    • http://hookup756.fun/what_are_the_natural_sources_of_atmospheric_carbon_dioxidelmjmy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_5c5923e38f2940988d96cee49d1bfae9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/753257e8-afa1-409c-a130-c153a3fa226c/lelesosu.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_c5ec91b2e9b941bfadf84195410c092e.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_af14fad8aac54f2b8c40452da8aaa20b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8d0b43-c7c6-41a3-a56c-a3b4af7f0e63/18687602093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff0698d-d798-4db8-9947-19b7c7db994e/70120075902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ebd9e6-71c6-46ac-8214-69c7bc35891e/75250105267.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_b9f96d87b8644b7187f3960b3db809fa.pdf?index=trueIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_3ee49dd4c35542b9b24a0d1479398072.pdf?index=trueIn PDF document text
    • http://buwijakuwomem.rf.gd/61576350802.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_d4a0902cd51f4a34995ad5660871b014.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1863b72-65b2-499f-bafd-cdd8d6700460/what_documents_are_needed_for_real_id_in_new_jersey.pdfIn PDF document text
    • http://magisavupuwikiv.rf.gd/atharvashirsha_lyrics.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_9fdb93ae3fc745aea7a38ed91bdbe559.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac22a4f-d010-4a71-94dd-5dc36d77cbc7/47989657643.pdfIn PDF document text
    • http://zubulunijegi.epizy.com/namiganigafurinumuxekeru.pdfIn PDF document text
    • http://dagapevas.rf.gd/loop_antenna_calculator.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5300 bytes
SHA-256: ea71a30abb18ee3bf3fa9f385c1e74fb6888991a64b34b10aee138c754a6c3e8
font_01_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 11148 bytes
SHA-256: d16ef5a7a149c8fc05bfa1c23144fc43c896acb029dce3a30096832173e5e38a
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 16876 bytes
SHA-256: 73433758e90541740adbcb1a57c1709f6ce0a083610f5acf38f16f8072057b03

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