Malicious PDF — malware analysis report

Static analysis result for SHA-256 091df19962928c48…

MALICIOUS

PDF

68.0 KB Created: 2020-11-21 22:34:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e3d5a6e0b19bd9766d609f88d5616a59 SHA-1: d57d47d3fd32ef4a76de296fa5a8250b1b96b206 SHA-256: 091df19962928c48294d5ceafb027c899450e43aba2c343dd40f7b4e8369625a
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/aws?utm_term=a+guide+to+modeling+counterparty+credit+risk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f9ee8a92a092.pdfIn PDF document text
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/gatageg-goxumogifebim-masiwurixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_5fad631a28fd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5f91c7ff2eba6.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/2818344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fb50b7009d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_5fb61c20ef128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f873ca7e754e.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/vejojelig-suzasosowiwubov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5f8fda7432c35.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/377c8b.pdfIn PDF document text
    • https://mukiniga.weebly.com/uploads/1/3/4/3/134318698/73f2790beb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/mewewawilajatafi.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/fizuxakawupuvof.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_off0000cc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 5548 bytes
SHA-256: 13d1581c4699dd200928b8b30270dae6f73ecbfc64a246dc985c5e1c207e51aa
font_01_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 10596 bytes
SHA-256: 4914f851f531abe5cd748ceeac543c4941c9fd51706de86c19bc9e7be4e99b86

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