Malicious PDF — malware analysis report

Static analysis result for SHA-256 da703de2fc436fde…

MALICIOUS

PDF

71.0 KB Created: 2020-12-21 04:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 147f682a47be6d5fe9b937e867f660b3 SHA-1: 237ecaaa08d00832c7813c29c2887064b8e38e8c SHA-256: da703de2fc436fde368161130ed8107a7cabf694c0ef7af6b24e934c346e72e7
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 0.9997

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://trafffe.ru/123?utm_term=greenworks+pro+80v PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495059/normal_5fcdb886b9b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5fad266533345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f89b386720af.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/a834f5a27fc22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383928/normal_5fde70512085f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5fab952244312.pdfIn PDF document text
    • https://mewejubakokexal.weebly.com/uploads/1/3/2/6/132681976/1421003.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/ruvexolafogixega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5fa89027b26b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5f8e50fb2f179.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/fimiwit-baroje-gavozuzofikanu-mewiguwosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0062edabee7b4407df07/1606221922839/imac_a1224_disassembly.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdea7f851e6b539731cab78/t/5fdf6a6ca478394ebcb52f40/1608477293428/dalebapumabopexopalo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 4816 bytes
SHA-256: 5a8309690ab54c6343a061c761112cf6e49022cf4f0526e3113c065690e9e426
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10888 bytes
SHA-256: 9ca8ff20aeb622a456ee84930da995824bcbb3e040a31afc98cd4a0e6e3c4d8b
font_02_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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