Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a2525137efefb6…

MALICIOUS

PDF

88.0 KB Created: 2021-03-03 17:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 364749a98ac0dc5ba6cd3ca779c3f833 SHA-1: 5b84e84b7b65eda4442f5260eb0ba8197d3859f3 SHA-256: 94a2525137efefb62c1c7f62592465230f3ac7f0a3b9be2186a2667c6b3445d0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://nipisod.ru/wb?keyword=what%20is%20the%20electron-pair%20geometry%20for%20n%20in%20nf3 PDF link annotation
    • https://sotumeramevoma.weebly.com/uploads/1/3/0/9/130969712/a2764df6bb.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/5df3553af.pdfIn PDF document text
    • https://witufulovavivoj.weebly.com/uploads/1/3/4/3/134351467/c3296e4.pdfIn PDF document text
    • https://mufobaxepomek.weebly.com/uploads/1/3/4/8/134866816/8638761.pdfIn PDF document text
    • http://zupubovogigu.iblogger.org/72032456072.pdfIn PDF document text
    • http://masuxokovofa.66ghz.com/mewez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5ff845c590242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivoganunew.rf.gd/79051146174.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/westinghouse_timer_instructions_28483.pdfIn PDF document text
    • http://tokavazeweg.epizy.com/werewolf_online_mod_apk_0._22._6.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/norijib.pdfIn PDF document text
    • http://zukixewagiv.epizy.com/why_is_usa_the_greatest_country_in_the_world.pdfIn PDF document text
    • http://mevusajilitum.rf.gd/monstrosity_synonym_list.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 5740 bytes
SHA-256: 67d1095a2092e6386332b2ff5be7989e139724ddd5e2499070d21ba5250ed1eb
font_01_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 11424 bytes
SHA-256: a0e49a1c4488f689789ab7e1c79bf1477ba1f57fa4604439b3623607812c8475
font_02_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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