Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afc1db1e21b06cf…

MALICIOUS

PDF

62.5 KB Created: 2021-09-24 05:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7cf5f01be7e2e00af2c0ebb285d3b3f SHA-1: 10a2768344db13c4b96077daf9a5048391e5a545 SHA-256: 2afc1db1e21b06cf9f26275d203d01c8a8ac51a7e8f10c2ac015168770ce5606
124 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious external sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

Heuristics 4

  • 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
  • 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://ketchas.ru/uplcv?utm_term=how+to+save+webpage+as+pdf+in+chrome+android
    • http://hublihorse.com/uploads/userfiles/files/zirurufutefajul.pdf
    • http://promocode.lu/userfiles/files/kakoda.pdf
    • http://kindergartenhelden.at/upload/file/lutowupixowubo.pdf
    • https://samngaimarble.com/html_upload/file/55268275715.pdf
    • https://beldaoyun.com/calisma2/files/uploads/nibijerevuravililat.pdf
    • http://hlqh.net/userfiles/file/20210909110917_1800712367.pdf
    • http://scsychem.com/upload/files/jivezeluxi.pdf
    • http://bebsulmare.com/userfiles/files/misezafep.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/noxupakenek.pdf
    • https://fanaf.org/article_ressources/file/mobosetetudep.pdf
    • http://cesarrodarte.com/userfiles/file/meduvexonaxomubikeket.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/zukosabof.pdf
    • https://karlschool.org/uploads/files/202109140229464625.pdf
    • http://phutungototuanphat.com/img-tvdl/files/litivirawomaloror.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/60792914970.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/59309183958.pdf
    • http://akgwealthplanner.com/crm/files/35999417256.pdf
    • http://www.jindatunnel.com/up_files/file/rusegot.pdf
    • http://ckpak.com/fckeditor/userfiles/file/60905886712.pdf
    • https://studiopros.com/userfiles/file/
    • http://owv-sad.de/userfiles/files/maropegajurafivona.pdf
    • http://dhf-china.com/d/files/82998971238.pdf
    • http://www.workbythai.com/admin/assets/images/18110107093.pdf
    • http://househouse.it/userfiles/files/34933813837.pdf
    • https://groupunsur3.com/contents/files/11496417713.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes