Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf23b01b443f3bb6…

MALICIOUS

PDF

83.6 KB Created: 2021-02-13 10:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 12110def9be6024f251f7adf3c3a5cd1 SHA-1: a64b9b6d3c597805acc0ea0915e36f88ff22b7e4 SHA-256: cf23b01b443f3bb6e7b37deb8c1faf803fd074ca3ced31bae982ab1f925df27c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs suggests the document is designed to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/aws?utm_term=bansko+ski+resort+snow+report PDF link annotation
    • http://copyrightviolationcenters.com/gopiveteno0919j.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/wubexogefese-wedanibakejelid.pdfIn PDF document text
    • http://bogplaktnc.fun/dr_house_capitulos_completos_en_espaol_latinoxd41j.pdfIn PDF document text
    • http://prodson.fun/btd5_hacked_infinite_money_onlinepnokm.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/9143672502c6w0f.pdfIn PDF document text
    • http://tapabafana.22web.org/6346509129.pdfIn PDF document text
    • https://kaxupigokib.weebly.com/uploads/1/3/5/3/135324743/tefazog.pdfIn PDF document text
    • http://fapubozapanez.iblogger.org/o_tera_happy_birthday_song_audio.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/5316250.pdfIn PDF document text
    • http://romeoplanet.club/bosch_wff_1101_manualgqt2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sevoga/51316022255.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/jaguxapelewegazur.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 4776 bytes
SHA-256: c9830f0d292007576239b48c60d4a74cb5d180d65328c0c0cad2e14b670c1ae6
font_01_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 11380 bytes
SHA-256: ecbacb25933e835a9722fd28cf328c192d82df08c6045fb4044c913056a6ed22
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 16260 bytes
SHA-256: 16d3f8655114d0902318f1a45715520560773d3bf5e390d74f207be828cb3ad7
font_03_sfnt_off00013315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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