Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f462c7f69aabef…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 19:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6268992187d211a1d093256c62578fdc SHA-1: 4b282bb27e78964afa2a1b03b26fb4bee9dbd84a SHA-256: 88f462c7f69aabef7233cf3bb883c9095a0be97d8b164543c8edf4f66186a326
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains hosting PDFs. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://1qjd.com/upload/files/2021-09-05-23-34-37-aUKqPerT.pdf In PDF document text
    • https://biodez.lt/i/File/koviputijopamunaj.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/60101465342.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/dosokotezukuwaxiza.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/71928216740.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/17043761145.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/batutisusapojamivamigidiz.pdfIn PDF document text
    • http://progetec.org/userfiles/files/64680820086.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/79571670644.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/33318335799.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/mukuxaliwodiwuv.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/29535783119.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/49677546085.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/33684874869.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xizupuwiwisebet.pdfIn PDF document text
    • https://mashura.co/userfiles/files/makipumebasisuvo.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/jevezamebuvovupo.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090612113542.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/2279957607.pdfIn PDF document text
    • https://terracell.info/images/file/70179508443.pdfIn PDF document text
    • http://chayka-svg.ru/files/sabejikixagezewepupatovud.pdfIn PDF document text
    • https://bdata.vn/upload/files/61688070471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=crafting+and+building+1.16+apkPDF link annotation
    • 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://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_off0000bd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD11 10900 bytes
SHA-256: bb6220a1c83a67a1676dc40ecb46e78c7dc4d1b8bc7910f1c4a81e15fecdf5a3
font_01_sfnt_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 18588 bytes
SHA-256: 8c53323a298c96d2eb8822fa08c87b82eab9009f83e7645ee2c89322cd2cc7dc

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