Malicious PDF — malware analysis report

Static analysis result for SHA-256 a274eb23e090e9ab…

MALICIOUS

PDF

72.8 KB Created: 2021-03-01 11:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 69d84dbc5f5fd389f7c8544f12d84aef SHA-1: 1633aacda5963a32aa0be4ae1e2cf002fa94a6f7 SHA-256: a274eb23e090e9ab5f0c97cb6b4507f094c0fbd2b60d3222e043e3323ce4f5d7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external links and the PDF_SEO_LINK_FARM heuristic indicate a likely phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://lozipotod.ru/award?keyword=lauren+kate+fallen+review PDF link annotation
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/7566894.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/7VJCwij/traffic_racer_game_online_play_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/jif3gf0/swipe_manager_soccer_mod_apk.pdfIn PDF document text
    • https://nerolokem.weebly.com/uploads/1/3/5/3/135326062/xavitelosak.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/ibMGRhd/97973171790.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/tzEihif/free_slots_with_bonus_no_download_or_registration.pdfIn PDF document text
    • https://javetepamez.weebly.com/uploads/1/3/0/8/130814931/dirilozewarur.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/daraniwekamidir/platform_sandals_black_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/14176824156.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/gisuzedefaw.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/worksheet_days_of_the_week_in_french.pdfIn PDF document text
    • http://zetuver.rf.gd/20171105081.pdfIn PDF document text
    • http://kewatolod.rf.gd/bijopawawokexesu.pdfIn PDF document text
    • http://gevewodex.epizy.com/ccna_firewall_security.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 4740 bytes
SHA-256: 09dc58b12f2227c76695ef39edbdecc5ba32e6d282daf8c089a522669be07954
font_01_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 10044 bytes
SHA-256: 8b5e848a68ad46fa81f33abdcc0a05a57888ef93e53f6d4f2e295a16f720e278

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