Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb9822db742ac5c…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 00:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 721fe2a125feb7a777faed191d8ba61b SHA-1: df69798ec183b4a11055a9a98ea6a5b46d3850f1 SHA-256: 6fb9822db742ac5c6c1196a8c58cf6a55972c27f8b9142e9b7afce6fbe15dcf7
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=how+much+weight+can+a+125cc+atv+pull PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/esViggc/pobimivagikizigugef.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/jarobutigaratedolul.pdfIn PDF document text
    • http://vedakedudeloko.22web.org/podososokubaxozu.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/condensadores_en_serie_y_paralelo_ejercicios_resueltoszvboc.pdfIn PDF document text
    • http://allostar.buzz/98282468712xpa8t.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/iihiJmt/21776209551.pdfIn PDF document text
    • http://hookup750.website/amarilli_mia_bella_tenoryaob4.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/gabejosoxevaji.pdfIn PDF document text
    • http://podarokinsta365.site/cd_sleeve_template_publishersag73.pdfIn PDF document text
    • http://xixubitawub.iblogger.org/ascendancy_pc_game.pdfIn PDF document text
    • http://ribipoxufepe.iblogger.org/acr_call_recorder_license.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/letter_format_for_granting_permission.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/Z1jhHgi/petemo.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/wukara/79243107490.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/nesoxokamudinugejenapu.pdfIn PDF document text
    • http://totofexux.epizy.com/zisokakikojow.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_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 5496 bytes
SHA-256: c2c8891bf1494d472442cc3d3b20cdd2ac27ea3f8312b9cf6dea13676bb20ad5
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 11412 bytes
SHA-256: d64b02afb320965273bda356b3c5a27c004a46b27108f294b0b779df9965d6ba