Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aefed78b0291f16…

MALICIOUS

PDF

79.7 KB Created: 2021-04-28 22:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8f31adadc91a8183d68ab54048b93e45 SHA-1: 4f7274b6453955bca093bcba31ccaab7b8488e5c SHA-256: 9aefed78b0291f1643c43d68ad525e14b84daa8c17587d19f12fb369df48e7eb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://pelibifir.ru/strik?utm_term=poetry+for+dummies+cheat+sheet PDF link annotation
    • https://puwirobazavuwo.weebly.com/uploads/1/3/1/4/131453501/deraref_gigugivul.pdfIn PDF document text
    • https://xamizozuzubo.weebly.com/uploads/1/3/4/4/134454881/9074920.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/57602102d968bdc.pdfIn PDF document text
    • https://natozimokuwepef.weebly.com/uploads/1/3/4/3/134398015/nafirewalup.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/967392803137ummh.pdfIn PDF document text
    • http://profapp.pro/best_spanish_english_dictionary_for_studentsuomgv.pdfIn PDF document text
    • https://pebizenif.weebly.com/uploads/1/3/0/8/130874023/jovopiban_pexexine_fogudon_zanuvazo.pdfIn PDF document text
    • http://my-favshopf.online/wesonokujajijefizzd0hw.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/5940665.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/4287750.pdfIn PDF document text
    • http://blue-tick-central.com/nesibavepit6ckok.pdfIn PDF document text
    • https://fupomojokom.weebly.com/uploads/1/3/4/4/134458651/9730276.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/pexodugosa/tabinakivoxowureguxilu.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/80746980840.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/vatumelemomidaxigivego.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_f03e83627bff480ea12ae2ef1f6a1004.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/bevuposugezibufevadego.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_f9f0433e182741c0acccf743962e9c8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/zosineril.pdfIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_a4b1477a3a6a434f8585cc8fa1f15d31.pdf?index=trueIn 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_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 5332 bytes
SHA-256: 90a2881776f43f0d87d02acadf6427802b46e0a74be606d5bbd31149ede8c279
font_01_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10912 bytes
SHA-256: a18ac96f344fd4de4dd00b8c19ee239be42e78b0d9c58df77eddbcbc5d79c8c0

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