Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb672079f814e57…

MALICIOUS

PDF

81.0 KB Created: 2021-03-28 01:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6ce5fe36bd2667da9cf54bdcc727dd SHA-1: 6bb51eb33ecc80036945270bc931e67a5fd99b17 SHA-256: cdb672079f814e57ec69c395cdabf211fa14c955623a2155bc6b22ce8188eacf
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, forming a link farm, with one prominent URL being https://vilenefex.ru/123?utm_term=growtopia+surgery+guide. The presence of a "Callback phishing phone lure" heuristic suggests a potential social engineering attempt, possibly to trick users into calling a fraudulent support number. No scripts were extracted, but the extensive link farm points towards a malicious redirection or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/123?utm_term=growtopia+surgery+guide
    • https://tolutewegudef.weebly.com/uploads/1/3/4/0/134097468/gavarulirozepolexati.pdf
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/neritupavelarezego.pdf
    • https://nuwevalixur.weebly.com/uploads/1/3/5/9/135990129/3970381.pdf
    • https://cdn-cms.f-static.net/uploads/4407777/normal_6034d1a8a5df7.pdf
    • https://static.s123-cdn-static.com/uploads/4369900/normal_5fc59c1254681.pdf
    • http://ximusoxe.22web.org/49229828640.pdf
    • https://static.s123-cdn-static.com/uploads/4478383/normal_600276cb06959.pdf
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/1c4c0694930.pdf
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/denipirena.pdf
    • http://ribugiwegi.22web.org/what_to_eat_after_gm_diet_plan.pdf
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fc8749b8a968.pdf
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/b1d8b2baa8fe0.pdf
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/pomana-basamenalu-kojiko.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5fe8f56c90d4e.pdf
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/225631.pdf
    • http://vevufilusik.scienceontheweb.net/mappa_cefal.pdf
    • http://vurujupafowutox.mypressonline.com/bivajogukokuvufulekigoxur.pdf
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/ecc73d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vujapoguxesak.myartsonline.com/search_google_images.pdf
    • http://bidexegope.epizy.com/kilpauk_garden_road_guideline_value.pdf
    • http://tifilow.onlinewebshop.net/crnica_de_una_muerte_anunciada_captulo_1.pdf
    • http://wafibajew.epizy.com/asus_rog_gladius_armoury.pdf
    • https://medlineplus.gov/surgery.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff99.bin
14cdf7916ec141ad359466fa7fedf9a320f088638ca0fe8756f9b097b5406a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 5320 bytes
font_01_sfnt_off000111d8.bin
88182aa6c757cf2a5030d9e0bfa471e073aae51d98925b162c2f5378f92f6866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 11064 bytes

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