Malicious PDF — malware analysis report

Static analysis result for SHA-256 814fa196a58af07d…

MALICIOUS

PDF

67.4 KB Created: 2021-01-08 09:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 554b8d3349d7b8f589eace0ec05db67a SHA-1: e75f46f4ca64a2308f7b7dc58a0a78925cbce02f SHA-256: 814fa196a58af07d4bdef9de09c5fc1b3cb912941c9fd140e747ce0d2dbba22e
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. The presence of a callback lure heuristic also points towards potential social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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
  • 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://trafffe.ru/123?utm_term=medicom+channel+guide
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/pepodakibumepabu.pdf
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/7668055a9.pdf
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9a83be6f.pdf
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/4733702.pdf
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/7673784.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/9333711.pdf
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/xejovuzesa.pdf
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/xitafanasoxasu-fudowot.pdf
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/462714.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/efddea96-ecd5-43ab-a31e-beaac4cb8619/50138746824.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_off0000c811.bin
ef73b06a1655fbddf0b947fc7a14297b2f877484f79ae7315a8ededf20556551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 5084 bytes
font_01_sfnt_off0000d941.bin
0b9b7161b9da361bcb64d9775fbab1ace14c86bafa780ceca9de2f7a38f7e95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 11928 bytes

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