Malicious PDF — malware analysis report

Static analysis result for SHA-256 f843a68f8fb42f6b…

MALICIOUS

PDF

82.4 KB Created: 2021-03-24 10:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 76372bc8ffb4659dd7971425f173c5de SHA-1: 725e40cbfc20d315f76c700a7fa144b33fedfdef SHA-256: f843a68f8fb42f6bfd33c44607e03578c9fd8064b266ec29df9a10ddd56d3bd3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/wix?keyword=lion+and+hyena+symbiotic+relationship PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404730/normal_600a662f806cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492573/normal_600059edd3e12.pdfIn PDF document text
    • http://xaxigizin.iblogger.org/lekalorodapar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c921b55fb.pdfIn PDF document text
    • http://fodosokidorakig.22web.org/intgrale_double_coordonnes_polaires.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/elkay_drinking_fountain_service_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_600c9849d8c6f.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/machine_learning_for_beginners_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5fe23edfa5a83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_6023dbddd8ea8.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/how_old_is_my_ducane_ac_unit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_601720803cdc7.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://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_e25f12e1eceb4033b36850fff60edc67.pdf?index=trueIn PDF document text
    • http://ragidunu.rf.gd/63621806177.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_0e403ec0a3c64760851ee182542f3b95.pdf?index=trueIn PDF document text
    • http://mojezira.rf.gd/state_space_representation_in_canonical_form.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/bt_smart_hub_instructions.pdfIn PDF document text
    • http://ribowiga.epizy.com/navijujimuki.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_5fe4c12530c4426db054365a83794e28.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_3656c91f38b2453f8834ebc80040a7be.pdf?index=trueIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_76a530109fd54f99af62553bd7067299.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_abe2f770a6ad40a29466ac634b28b708.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_cd8e5ed8839a451b940a8d7ce8d789f9.pdf?index=trueIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_5ebd7667b324466cb8aef149ab31d8c5.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_7d1e3dba7f284368829beb1094731c79.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 5284 bytes
SHA-256: 16289462b59b4f212560c4a918238383d9a0c557b502faec67fd94e3d1da677c
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 11260 bytes
SHA-256: 84e00387450df4b10822a0573c90515c7f5412eff292f83c1161caa8fe62f7c6
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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