Malicious PDF — malware analysis report

Static analysis result for SHA-256 772fd19650dcf215…

MALICIOUS

PDF

71.2 KB Created: 2021-03-25 07:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1427f5fecf4739975420fad588182b98 SHA-1: 65428ed3be3991c381d41c0a74193bec69bfd267 SHA-256: 772fd19650dcf215170fe9f8b9d75b095b6194637c050659eecec34e84a01b43
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing scam by luring users with fake billing or refund issues. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate potential for exploitation and redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=certified+honda+outboard+mechanic+near+me
    • https://static.s123-cdn-static.com/uploads/4426066/normal_60057e0c29c83.pdf
    • https://cdn-cms.f-static.net/uploads/4369901/normal_6031e694c0e91.pdf
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/kupawo.pdf
    • https://cdn-cms.f-static.net/uploads/4447079/normal_601bc987d6114.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_60330ed9c1b0f.pdf
    • https://simisidexibasu.weebly.com/uploads/1/3/4/5/134502995/8ac75c6.pdf
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5feb213fded37.pdf
    • http://vasizazesunof.medianewsonline.com/fobafezotunozifunemibel.pdf
    • https://cdn-cms.f-static.net/uploads/4459185/normal_5fd78dd52e232.pdf
    • https://cdn-cms.f-static.net/uploads/4471484/normal_5fd0b3821620e.pdf
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/7508919.pdf
    • https://zitewamim.weebly.com/uploads/1/3/1/4/131454986/046620ddc6c6c27.pdf
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/2219407.pdf
    • https://xebutalumibafa.weebly.com/uploads/1/3/1/0/131070398/e56d0ba6b1a.pdf
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/9731819.pdf
    • https://cdn-cms.f-static.net/uploads/4476939/normal_601705b4cfc4e.pdf
    • http://zememor.sportsontheweb.net/what_were_the_largest_cities_in_1900.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuvepilamamuse/lumasusofasaxez.pdf
    • https://s3.amazonaws.com/zonebon/xokisaxi.pdf
    • https://s3.amazonaws.com/pusolefosex/kixupoxelipex.pdf
    • https://s3.amazonaws.com/kaxukok/sebab.pdf
    • https://s3.amazonaws.com/gulapore/guided_trekking_tours_scotland.pdf
    • http://xekazaz.myartsonline.com/98989331647.pdf
    • http://sanojepenot.onlinewebshop.net/32126419979.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0f.bin
c80c185a308c6beb52a6cb8b14242d85232dedcc48a18a960fd40af369579f24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 5096 bytes
font_01_sfnt_off0000ec35.bin
98b51646f2d9e159a440711d4b9189d891d1472bfc63ee5a107e9ade2b86d39a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 10300 bytes

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