Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e9be778fbbcee8…

MALICIOUS

PDF

80.0 KB Created: 2021-05-17 19:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5912a5ea8af52a0623e5c4ca57fb5642 SHA-1: 87272d26eefba4fcd64ddd42a807439fafefb4c4 SHA-256: 44e9be778fbbcee871ae19a1004e63133656a56d149e07e60ee4ca2c148d4394
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/strik?utm_term=2008+maserati+quattroporte+sport+gt+specs PDF link annotation
    • http://jarowulizose.sportsontheweb.net/58209112625.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/45796303337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_6055ae171bd3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_600c037a96753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_6007d09c72493.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/how_to_make_bioplastic_from_banana_peels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5fea0b43bb670.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/84241456884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_601c6b72138fd.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/26717892203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_3654d59de2364c308d471e06fe0c9acf.pdf?index=trueIn PDF document text
    • http://pusebirenox.myartsonline.com/research_methodology_in_psychology_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16104bb-46bc-4a96-88bb-8de08bb3ef31/why_is_my_epson_printer_not_connecting_to_my_computer.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_e1a81e0da18c4facb9a2b1f0871f456f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d856d6-77cc-418b-b872-a49055a6bb92/how_to_prove_you_are_judgement_proof.pdfIn PDF document text
    • http://kumugirenukelil.epizy.com/15483947865.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/aday_retmenlerin_okumas_gereken_kitaplar.pdfIn PDF document text
    • http://jewalozuda.rf.gd/97303316343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e98eaad-f5bb-4756-915b-3914936067b7/fingerpicking_guitar_songs_tabs.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_40bb3e03688e4109b069f2462c5f8a66.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5720 bytes
SHA-256: 0775360e275b10ecc5ae72e38e4b22b1e8391809c3b09cd1422525cbc86ecf53
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 13632 bytes
SHA-256: d50da8749402c94fdb08182e2b9370e305eec790a25ede373e3d5413f73c03c3

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