Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a31652f476f8cf…

MALICIOUS

PDF

88.8 KB Created: 2021-02-18 04:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 80c36b5e4a72ee9f981ee95649bee58a SHA-1: 56206fc8bd0510fce48f5e6b56ef95bf9c9fe462 SHA-256: 70a31652f476f8cf09636ce265930e62e36af10da0089495431015e51fa33d76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://jottigo.ru/aws?utm_term=onkyo+tx-nr509+price PDF link annotation
    • http://bridgecommerce.com/animal_crossing_new_leaf_villager_guide4737j.pdfIn PDF document text
    • http://shoop-fp.ru/solution_manual_structural_stability_chengqkwv.pdfIn PDF document text
    • http://feedbacrnz.space/xesexogaritafaf304.pdfIn PDF document text
    • http://winfreeiphone.xyz/650526682498biqx.pdfIn PDF document text
    • http://gimazazutakegi.iblogger.org/advantages_of_external_style_sheet_in_css.pdfIn PDF document text
    • http://nutristrike-shop.ru/17288731523kek7a.pdfIn PDF document text
    • http://copyrighthelpcentral.com/ice_cream._maker_ballg9pe4.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/ja2CihV/60125682741.pdfIn PDF document text
    • http://vvd.bar/agreement_sentence_worksheet0fbyn.pdfIn PDF document text
    • http://zakababonedip.iblogger.org/79733270190.pdfIn PDF document text
    • http://soul-felt.com/sniper_3d_assassin_cheats_without_human_verificationf3mew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poresiz.epizy.com/metal_gear_solid_hd_collection_ps4.pdfIn PDF document text
    • http://netojisabozop.rf.gd/2018_animated_movies_free.pdfIn PDF document text
    • http://sulupajus.rf.gd/binkw32._dll_gta_4.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_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 5224 bytes
SHA-256: 84981dcc976696db2f5dbbc50873ea31c40bbbfdb234d8bd3269fbb6272ee9d1
font_01_sfnt_off00013082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13082 11048 bytes
SHA-256: 9274a9175031e2bd037ad0aab269490bb967b80b300906482f50c7e31f3cf1e8