Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4768f45a6781a38…

MALICIOUS

PDF

83.4 KB Created: 2021-03-31 15:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9e86642510c0b194cbd7b664c208115 SHA-1: 9d49bb7486271de1ceb9da2dc387bf7bf83cc0d7 SHA-256: f4768f45a6781a38fff8364f4ce84aa3aef6164fb5a92412ec8c2dcf57d07402
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a heuristic specifically identifying a 'link farm' designed to generate SEO traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing unwanted content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=explain+the+difference+between+gross+and+net+investment
    • https://cdn.sqhk.co/musezikuzapi/ighgaHE/beat_hazard_ultra_apk_full_free_download.pdf
    • http://elerctum.org/how_much_does_it_cost_to_2jz_swap_an_frsngpcq.pdf
    • https://cdn.sqhk.co/fikalibumi/6nIibjd/36277988661.pdf
    • https://cdn.sqhk.co/bilexodofose/9znggji/gumotaburibak.pdf
    • https://cdn.sqhk.co/rivogigaweb/jbgcgj3/malayalam_movie_quiz_game_answers.pdf
    • http://zdsshop.top/347446214235q3t4.pdf
    • https://cdn.sqhk.co/sivefuxonix/hejdivP/final_fantasy_crystal_chronicles_remastered_edition_price.pdf
    • https://cdn.sqhk.co/febapaji/hieRiih/jumpstart_1st_grade_math.pdf
    • http://mklhhhh.space/sipivixetofasikogujogovedz8msu.pdf
    • https://cdn.sqhk.co/kojetovukufo/ibhaKqZ/wupowotapuxokeluwe.pdf
    • https://cdn.sqhk.co/tibatojo/mGtghhg/varuje.pdf
    • http://kengoru.space/jasegozixidezosexarugu433hm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lakadutof/35768876773.pdf
    • https://s3.amazonaws.com/xamapebonijos/socialismo_real.pdf
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_ec068a06cb82471e8f269ac364a00b64.pdf?index=true
    • https://s3.amazonaws.com/benuka/trigger_interview_questions_and_answers_in_sql_server.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_c327ceb98ca544a0a1c69c0e48358c41.pdf?index=true
    • https://s3.amazonaws.com/kosamupim/sedimentary_rock_worksheet_middle_school.pdf
    • 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_off0000f886.bin
8f2029a191954165b0bd4999e05ce684568445adba4b11defb8a74b3fa00a41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 5672 bytes
font_01_sfnt_off00010bc0.bin
d40704f81bc0daf2aa3dc1a975787eccc7900308ca660d18612f2c056522ed38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 11076 bytes
font_02_sfnt_off000131a0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 4324 bytes

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