Malicious PDF — malware analysis report

Static analysis result for SHA-256 101267fe76b0ea74…

MALICIOUS

PDF

131.5 KB Created: 2021-04-08 08:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9abcfa5245f62641c91cc464e0904a81 SHA-1: 52c79236e529c09f60ac440a1bc6f65a6596cc74 SHA-256: 101267fe76b0ea740f7939f5249a3ddf2c263eee3fbe8215a14775dd12bc7aed
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, 'https://fokemale.ru/wix?keyword=arthur+becomes+king+of+britain+answer+key', indicates a lure related to an 'answer key'. While no scripts were explicitly extracted, the ML classifier flagged this PDF as malicious with high confidence, and the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://fokemale.ru/wix?keyword=arthur+becomes+king+of+britain+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6031924287cc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369511/normal_6006bca66024c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_6065679381d69.pdfIn PDF document text
    • https://tupetemen.weebly.com/uploads/1/3/0/7/130738754/dusapomarowekaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_6046eb90acfb1.pdfIn PDF document text
    • https://cdn.sqhk.co/kutagigixef/jeKlhdH/animated_theme_for_powerpoint_2010_free.pdfIn PDF document text
    • https://pogeruriwijo.weebly.com/uploads/1/3/4/3/134340707/bidojewebuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_6022165fb8e66.pdfIn PDF document text
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/6ffccd14fe65f4b.pdfIn PDF document text
    • https://misiwutikamiba.weebly.com/uploads/1/3/4/6/134601431/figixeburusutopez.pdfIn PDF document text
    • https://nulokedebuzeb.weebly.com/uploads/1/3/4/3/134310318/0e34623b777068c.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/2X5dicv/occupation_2._5_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judotopefov.rf.gd/anaphylactic_shock_in_dentistry.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_77a86cc96ad4469384cbafba58831cc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/41473084082.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_9cbbc3412eee4b33a0adda867bd6020a.pdf?index=trueIn PDF document text
    • https://c8f0d892-4c73-447a-841b-b6a48a565a7d.filesusr.com/ugd/928a57_057d351d8a8e42c1a282ffd845281015.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/mf_dl_135_loader.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/persuasion_jane_austen_full_movie_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/52195563597.pdfIn PDF document text
    • http://zitejilid.epizy.com/accountant_job_interview_questions_and_answers_free_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C36D 5652 bytes
SHA-256: 091c0e5f45847fe9881b4c5cc9362a752fc05d7d29b1a67006bafae1bb806fcf
font_01_sfnt_off0001d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A1 13468 bytes
SHA-256: c2aeb2a2c4fef3633a4c3c356a0c44061c30464b376c2265ce8dbf310a0c5f9f

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