Malicious PDF — malware analysis report

Static analysis result for SHA-256 972def29138ed195…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 11:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29dd618e9811ac3915ace39777519b07 SHA-1: 232946b91ba2a1744639db1c870a599da4e7cf43 SHA-256: 972def29138ed1954f71725ab43b1490d8078843e08d5051354eb5186518ea4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to facilitate malicious redirects, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ylplj.com/ckfinder/userfiles/files/37417402295.pdf
    • https://livermore.com/wysiwygfiles/file/vikexidolukenuwizipogutiw.pdf
    • http://fskyok.com/uploadfile/files/73891788081.pdf
    • https://cathita.vn/upload/files/34903629347.pdf
    • http://faizleathergloves.com/userfiles/files/3817549133.pdf
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/virumujuzinakim.pdf
    • http://classtool.info/upload/files/39535073102.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613926207e6e8---35851801100.pdf
    • https://gtijsr.com/userfiles/file/34465841058.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/25064609291.pdf
    • https://miltonmattox.com/userfiles/file/60438940489.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/bewak.pdf
    • https://maintogelonline.info/contents/files/dilebenalatomozinabede.pdf
    • http://monteconsultants.com/image/upload/File/funani.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/virebevuserafuk.pdf
    • http://h04ydivan.ru/userfiles/file/zikapuvexepoponefisap.pdf
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/gowebovinujesikiref.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142982170fcb---12762011677.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/garorovokolejup.pdf
    • http://ukkies.be/userfiles/file/zuxogikafuxanadig.pdf
    • https://gemwares.com/userfiles/file/libudowatavuwikewi.pdf
    • http://najlepsietorty.sk/uploads/fck/file/wuwagefikulokef.pdf
    • http://coeb.eu/userfiles/files/lovisafozemar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bloodsport+vf+streaming
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf9.bin
db5488b4506492a09eeee44a5db693142a414f799243e258c7d85bfa659f2609		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 10960 bytes
font_01_sfnt_off0000e436.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16792 bytes
font_02_sfnt_off0000fc48.bin
9528e26f1f6b5554dabff0b5f6dd218decd7ba6155974a6c5aaf6f5340e74072		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 17592 bytes

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