Malicious PDF — malware analysis report

Static analysis result for SHA-256 3461d688dad286c8…

MALICIOUS

PDF

71.1 KB Created: 2021-02-07 08:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a73f19331981ef42a78ec10d42962874 SHA-1: a37727d9af69ada8d05e3d7fa88e919d53eb2a21 SHA-256: 3461d688dad286c8892d1bdf8606b71de0a0c928a6fd37bfe961c74cdd6af24b
194 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 hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic findings point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wb?keyword=tamil%20movie%202019%20%20isaimini.%20net PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fdaca7f627b9.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/Rjejjjj/samsung_pay_uk_customer_service.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414159/normal_5fe52d74bdfaa.pdfIn PDF document text
    • https://lolinukopo.weebly.com/uploads/1/3/4/3/134351434/ruluvuzivija.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/iXif2gp/maxisys_elite_screen_protector.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/nidadimujimivilakon.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/JSiigh0/family_feud_live_game_download.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/kusivumapelorasalowivebuvcxryz.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/hbjfVog/n64_emulator_for_xbox_one.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_600036075c763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5fd7745e756d7.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/46dc56229098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5fd1522742cf5.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/2691262.pdfIn PDF document text
    • https://jivefumo.weebly.com/uploads/1/3/0/7/130776755/pesadeximir-vezadomi-bimuwukageb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezujuwevan.epizy.com/nsf_grfp_proposal_guidelines.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 5260 bytes
SHA-256: a232bb4aa07047f4e2a4e369af6914b4d7bbb0ffc5ff98899567f22585dda878
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 10600 bytes
SHA-256: 42bda746400c2e42465e98da7b7732d431525a284e40d340c29a9df654061601

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