Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fb84c8235290fe…

MALICIOUS

PDF

73.2 KB Created: 2020-12-31 09:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b739e60011138c7a3c38d3294db0a90a SHA-1: d98796f6de02d03fd2e4509a1d7b5eafa63fe471 SHA-256: 93fb84c8235290fe85200552ebbd6abc35ed3c4b9d52aa99c544d324ecc017cb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits malicious characteristics, including links to known malicious redirectors and a large number of embedded links suggestive of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the heuristics suggest this file is part of a phishing or SEO manipulation campaign, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/strik?utm_term=does+he+like+me+or+love+quiz In PDF document text
    • https://wutiboduselojo.weebly.com/uploads/1/3/4/6/134665342/delapa.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/EQjdQj6/11194738608.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/ajeQ6gh/pegudazexavizame.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/6482699.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/jJgfL5Y/best_rechargeable_flashlight_reviews.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/tamejifu.pdfIn PDF document text
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/d496b69d7dc8.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/5DXIhgj/lutugelujajukazavenowi.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/gg2njgE/garurami.pdfIn PDF document text
    • https://tajedapen.weebly.com/uploads/1/3/4/3/134373213/pesezugexesome-lorubizerasimo-dovizerakufij.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/TibhbXy/10047490227.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/manuvunojoweta.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/tapexiw/fejejose.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/59669590695.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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 5012 bytes
SHA-256: f409f9e404f851a52df7e2fc15711704238267c1ef9c505b76b2d4907bc98b8f
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 11448 bytes
SHA-256: 0e94be4fde1af3f14fee245772e806d50a8856ac3cec7d05ed39423033e63150

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