Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ee80026af2e0d3…

MALICIOUS

PDF

73.5 KB Created: 2021-01-31 02:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7e75b4815532070da3c41401ba440afa SHA-1: 960924a881dec8f333adea74e12d79ed1af308e2 SHA-256: c8ee80026af2e0d369ba0185d39cd3fa86f4c9b2982748cc65d2e0a0668adeed
206 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing lure, with a high ML classifier score and ClamAV detection. It contains numerous external links, many hosted on disposable domains, directing users to potentially malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/123?utm_term=huffy+green+machine+jr PDF link annotation
    • https://cdn.sqhk.co/vipujitebiki/Bhbiihg/nitro_rc_fuel_line_length.pdfIn PDF document text
    • https://xebanodax.weebly.com/uploads/1/3/5/3/135382800/mawoki.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/5105798.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jiUgjtf/34328157723.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/96f0e217ae75.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/gimegotusig.pdfIn PDF document text
    • http://power-guard.shop/real_money_claw_machine_apphj0z9.pdfIn PDF document text
    • https://sogifeni.weebly.com/uploads/1/3/2/7/132712483/9167992.pdfIn PDF document text
    • https://xadaxiwunitari.weebly.com/uploads/1/3/0/8/130814235/gagad_sokiwut.pdfIn PDF document text
    • http://shmelev.pro/paleolithic_settling_downdfgk6.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/punagilelabon/vadeluragozalujoloropevuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/avg_antivirus_internet_security_free.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_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 5224 bytes
SHA-256: 7ceb3d9aef7fcca0952c8b2c6a76e5f65970f1e22de0296c2f8251919f534685
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 11396 bytes
SHA-256: 2af9b15c70f87c67bfe2591042f3f5762317e358064bf8702f9e4f8f36e750b2

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