Malicious PDF — malware analysis report

Static analysis result for SHA-256 e735716a689e6637…

MALICIOUS

PDF

77.3 KB Created: 2021-03-30 10:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0fa3405c1ef3cbc9fef61f3778cfa524 SHA-1: 9bb27875c7adf8cb288f4f07e857fd065fc0f007 SHA-256: e735716a689e66374e8ebe188d502be2ea2f4451e769ed6e944d903cc6a82f07
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://botokaw.ru/wix?keyword=spotify+premium+gratis+apk+%25E2%2580%2593+android+app PDF link annotation
    • https://sozusodugalonus.weebly.com/uploads/1/3/4/6/134614171/349b338f.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/vafodorudigudiv.pdfIn PDF document text
    • https://cdn.sqhk.co/javabufe/hbgjMig/lovudun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_603a91cf9425d.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/banidil.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/fgijeGG/bloon_tower_defense_5_free_download_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_6046e7cc4f382.pdfIn PDF document text
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/gisitop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fd12dfad04ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_60371c0521a5f.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/ja3EsDd/63340168862.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/foxedepaxipaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/gcCgh25/passion_fruit_harvest_time_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_604c9c2aeb962.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/idtZ6id/breaking_into_wall_street_400.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/5390445.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/jalapezuxaranorejeponok.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufexupomom.rf.gd/el_cantar_del_mio_cid_resumen_de_los_3_cantares.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_f6a151b53f4847c48455a70cb0363df5.pdf?index=trueIn PDF document text
    • http://surafupomef.epizy.com/vekirirojisumerexatovube.pdfIn PDF document text
    • http://vewitemagim.rf.gd/resident_evil_4_apk_english_language.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_2430963ecbf142d596b25be190446e36.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_b6a386d4c4b8420ba0d2f6b3aebf79f3.pdf?index=trueIn PDF document text
    • http://xetibewiz.rf.gd/wogowupojevopofew.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5628 bytes
SHA-256: 10244c2376fd74149652408d11f7e6efd2d8dc07cda89f028eedf5f3eee2e9c1
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 11024 bytes
SHA-256: dc8feb1ce85786a568c68bd7790ca3a721e572f9cff2e3dc43e933ea105be986