Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5821394cf66cb59…

MALICIOUS

PDF

81.2 KB Created: 2021-03-04 11:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe7a6f6e852732ec5bf3b472a2ab98e SHA-1: 91eb3267a8e0b0eda1dac0fa7c2dc69750e8cf3c SHA-256: d5821394cf66cb59620e86f41b7e2f577397ca6c157a58b1f69ba8f96d2af3fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to search terms, suggesting a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=notre+dame+chemistry+ranking
    • https://cdn-cms.f-static.net/uploads/4383924/normal_603aa6593110b.pdf
    • https://cdn.sqhk.co/novitovikor/ibtxijM/lipanapade.pdf
    • https://cdn-cms.f-static.net/uploads/4488116/normal_6021957dc5171.pdf
    • https://cdn.sqhk.co/mimofeto/degiige/space_engineers_xbox_one_price.pdf
    • https://cdn-cms.f-static.net/uploads/4459774/normal_60204b000ca95.pdf
    • https://static.s123-cdn-static.com/uploads/4393791/normal_5ff61e2c5694e.pdf
    • https://cdn.sqhk.co/vimewiki/gfdkgJJ/amtrak_police_jobs_new_york.pdf
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5fe58add2a8fd.pdf
    • http://pigigozoruda.mypressonline.com/humminbird_piranhamax_197c_parts.pdf
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5ff261c5ac96b.pdf
    • http://jokebixa.22web.org/how_to_connect_onn_wireless_speaker.pdf
    • http://aycotoro0.xyz/astringente_definicinyeke1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jowemalawebabe.rf.gd/3739032711.pdf
    • http://vepobivadiwinar.epizy.com/hadouken_sound_free.pdf
    • http://xojozebu.epizy.com/purenadoxurokujejizonak.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f548.bin
0b3d76792037ebd97dafc7ce43fed6f872b1a96e5ef4831319c60c0f28d1f7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 5456 bytes
font_01_sfnt_off000107bb.bin
42c68c942282fc0d0b660e16165d47bf7d665ecb9bd20b790176ea79b5a4ac97
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 15472 bytes