Malicious PDF — malware analysis report

Static analysis result for SHA-256 481642c7b200ca09…

MALICIOUS

PDF

60.5 KB Created: 2020-11-13 00:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14786fca0d98caf965a72de5d61e562 SHA-1: e9560fa95f0e863fbdd0c7089d3bd05fa4d6ee07 SHA-256: 481642c7b200ca09cea0c3271e2158e388f21976dd25e7833907efd0b5dc75e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links within a small PDF. The ClamAV detection and ML classifier also flag this file as malicious, likely due to its content and link structure. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://trafffi.ru/123?utm_term=rca+digital+converter+box+manual
    • https://cdn-cms.f-static.net/uploads/4457014/normal_5fa2189d1f636.pdf
    • https://weroxodadugofu.weebly.com/uploads/1/3/4/5/134503620/5913470.pdf
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/c5ccb9.pdf
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/9602240.pdf
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/sasuma.pdf
    • https://cdn-cms.f-static.net/uploads/4415321/normal_5f9a4818afe15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jufowokedunod/beginning_stages_of_lamictal_rash.pdf
    • https://s3.amazonaws.com/navoburarovada/64692085039.pdf
    • https://s3.amazonaws.com/fujadabez/37623665041.pdf
    • https://uploads.strikinglycdn.com/files/817d8fb1-5bc8-443a-8da5-e23d84a472e5/veroravibedijezevalave.pdf
    • https://uploads.strikinglycdn.com/files/d2c40a57-482f-4ed2-9877-0f352a4a97f2/20264460359.pdf
    • https://s3.amazonaws.com/kakekojezutok/united_767_300_seat_map.pdf
    • https://s3.amazonaws.com/sazixipame/white_flower_girl_dresses_with_sleeves.pdf
    • https://uploads.strikinglycdn.com/files/0d73076f-453e-4193-b6ce-c71052eda1f5/rujafewotinasex.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_off0000af05.bin
991e35b4909cc88e76590f7cd82106c1cc924b27d18e844771e703f75f0128a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 5356 bytes
font_01_sfnt_off0000c139.bin
b021caf5fa048055c72438a1f3c5efdfcade1838b9b083addce59053fa1b1613
pdf-font-stream PDF embedded font (sfnt) at offset 0xC139 10356 bytes