Malicious PDF — malware analysis report

Static analysis result for SHA-256 842a746e911d996e…

MALICIOUS

PDF

85.5 KB Created: 2021-03-24 14:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 48833629e41ca4ae93c8111193a45a8d SHA-1: c39c8efcb13207a6d8e07bd7323a7f639bf1c385 SHA-256: 842a746e911d996eec3bb4392f212a892a6f395170817ccd25dcd01dfa33155c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One of the primary URLs extracted is 'https://maypoin.ru/wix?keyword=bissell+pet+stain+eraser+manual+pdf', which appears to be a lure for a specific manual. The document's structure and numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=bissell+pet+stain+eraser+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/wujamufaw/i18idAV/xolunowexinovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_6047115d518db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5fc7ab5d569b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_600ea120addd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_601139291b75e.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/hgngagh/past_present_future_bible_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5ff6815d029aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_605b094a91989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc84c6f5c846.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/MidhjCQ/62499111164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_602129934f80e.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/jacgdgf/muvudowikukiwem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_604307c46a98f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_60347eecf08ca.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/chgt9ih/42912854214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_e2e0961a074d408ca1fc7f2b918cda6b.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_8d84aa0f645044828bfa97c7360c880c.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_f684f860689b4de78354adddbc63b455.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_fc4bf28f41ad474e95d8aabbf25f96f3.pdf?index=trueIn PDF document text
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_1232e4152c22484da737e928fa4b0cd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/free_kindergarten_math_worksheets_addition_and_subtraction.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/harley_quinn_movie.pdfIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_a99ad49850bf4f3081b07a8f4676ce32.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_5998eae576c54f40bd335cf202405d7c.pdf?index=trueIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_cd1c83467a87449194a145aaf3632d0a.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_b4b7fc3c0e674029bbf05834841367a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/is_sentry_safe_1900_fireproof.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_fa71bc9d562f49c7bb10c7ae44989ae1.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_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 5236 bytes
SHA-256: 336f0541eba4d661f3b904337044de4321cc4cfa10d8119e1b934986952bc8d7
font_01_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 11164 bytes
SHA-256: 3790b85afdfea0da94ea2b3efe6c42943322cb23f2c76d80d6b86c8b82672fc2

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