Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f94a16b275a65a…

MALICIOUS

PDF

73.6 KB Created: 2020-12-25 00:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 015a071d0882ebe6ae59825f91176af5 SHA-1: b76be396374e7f8fd109e352406dc7db0734ceaa SHA-256: 71f94a16b275a65a16401a816ac6c7525c21054b00605fe17188fea8231041ba
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating it's a phishing or malware distribution attempt. It contains a large number of links to external websites, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious infrastructure. The presence of a link to a known malicious redirector further supports this assessment.

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://gettraff.ru/strik?utm_term=basketball+trick+shots+game In PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/3703733.pdfIn PDF document text
    • https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/figuwegu.pdfIn PDF document text
    • https://cdn.sqhk.co/dabeluza/liddMhj/57243160157.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/idVOHhe/bekid.pdfIn PDF document text
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/sokuwa.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/batobuvuwegupa-dujapisaloxuro-sutux-dirufasufipojog.pdfIn PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/4421332.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/naxededuloxuvuxege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5fdc4ac2cf7c4.pdfIn PDF document text
    • https://cdn.sqhk.co/sogupavetut/jcijjjb/build_battle_minecraft_map.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/7716bc277e.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/b67101f294e9.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/eghPiie/kick_the_buddy_forever_para_pc.pdfIn PDF document text
    • https://rawavofim.weebly.com/uploads/1/3/1/4/131452817/darelesetafozi_baxakoge_zurasutapimodud_wewepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 5468 bytes
SHA-256: 131e7e019aed89a7994b703d20ed2c1c886483763a02c7c9452f167b69743256
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10480 bytes
SHA-256: 4bb25e9b2a0ffe4891f63804b86755a5ca3bae23acdd8721e316bacb90020cee

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