Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e13c304dffa2383…

MALICIOUS

PDF

68.1 KB Created: 2021-01-01 04:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 042fddf0bc398f7224479c21bfb06bc1 SHA-1: 52a342c07119fcedcb2c241b0d383a88ea7391a7 SHA-256: 7e13c304dffa23832592e4a4de9df5096224ac02a3ab428f6f9a232e3301bb51
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=tower%20stack%20unblocked In PDF document text
    • https://namunoxup.weebly.com/uploads/1/3/5/3/135339392/878e9d37a.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/4jcPTDz/drag_racing_arkansas_city_ks.pdfIn PDF document text
    • https://tunefanixeso.weebly.com/uploads/1/3/4/7/134733210/cbc042670.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/hfwiihZ/go_fish_mystic.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/a1b29ba79f.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/2jfiahh/knives_out_cast_imdb.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/vonotufesodarilozira.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/552128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5fdc24796552e.pdfIn PDF document text
    • https://ponikinofenad.weebly.com/uploads/1/3/4/6/134602628/tujeluvija.pdfIn PDF document text
    • https://walasopi.weebly.com/uploads/1/3/4/5/134588780/4c20954fb.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/nafibanefexex/3014967714.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/67752209283.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_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 5176 bytes
SHA-256: 185ea88efe1f9a46e53599168065a8742b663be297c765ad866c55012ccd5c60
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 11364 bytes
SHA-256: 40a716c977712649de15ac0416ae31ce5e53aaa7244dc4d3e47e8f349282c88e

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