Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41fb24ca47687ec…

MALICIOUS

PDF

90.9 KB Created: 2021-03-29 18:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 030acd33da527a2ad22ac728b2354604 SHA-1: 254fd802431380154125e5f22011720007da1ec8 SHA-256: e41fb24ca47687ec4350f43fec7ce7fc8e03e095e76cd7ea562689624c0c4013
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://resalured.ru/award?keyword=autonomous+desk+manual+pdf
    • https://cdn-cms.f-static.net/uploads/4393628/normal_600afe4687476.pdf
    • https://static.s123-cdn-static.com/uploads/4420036/normal_5ffabde8d061d.pdf
    • https://cdn.sqhk.co/xafukapewe/pjfihjd/96037235385.pdf
    • http://sevowina.medianewsonline.com/how_to_build_ingenuity_convertme_swing-2-seat.pdf
    • https://cdn-cms.f-static.net/uploads/4424637/normal_60137bc808764.pdf
    • http://dafagaketa.sportsontheweb.net/catalogue_ikea_2020_france.pdf
    • https://cdn.sqhk.co/lumolixuwo/iGichjI/66908656939.pdf
    • http://jarokixepoweso.mypressonline.com/acl_tear_exercises.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kuderegeguf.epizy.com/gmp_training_material.pdf
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_bb0cae495ca74a1ca81c63a5eb1a8a8d.pdf?index=true
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_b6db5cb100984ca1bc96b27fefd03967.pdf?index=true
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_6c9cc771b6a44611917b07f39bf6d249.pdf?index=true
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_b8a6658762224cbfbb52d48ce375cb63.pdf?index=true
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_c16eaf6d64004c1a80389846e9b52149.pdf?index=true
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_3cb3d8edde4a4105a884e365c9816707.pdf?index=true
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_3afa4b8a34674d7ea5d07932b917f8d9.pdf?index=true
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_820720aa818e49059c3ef3ccaac78dbd.pdf?index=true
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_08b663c43cf9459db20bfe95e3a61cc7.pdf?index=true
    • http://dogufisojorosef.epizy.com/template_party_invitations.pdf
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_01937a53c67a4ca281ee9268fe3d7bc7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001144b.bin
1b494bec5133b8c39da153f3910df6bc851f1cba5768c56768b14f1019df5184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 4980 bytes
font_01_sfnt_off00012529.bin
41f711f4d38465f2a4fde4e67bf8c986974cb1b646223984a06b3f6c2d779447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 13000 bytes
font_02_sfnt_off0001503b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1503B 4324 bytes

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