Malicious PDF — malware analysis report

Static analysis result for SHA-256 0053376bce55f969…

MALICIOUS

PDF

83.7 KB Created: 2021-04-01 13:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 392a7aac772079913dc164ddb9522af7 SHA-1: 518aa177d3e87ad6d1342fa623598f0e1bcdd9a6 SHA-256: 0053376bce55f96994d5a152651f1c9fd845adb04fbd097ea052cbfd80aee36f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://dafemum.ru/aws?utm_term=ferrari+458+spider+for+sale+los+angeles PDF link annotation
    • https://cdn.sqhk.co/bitizulokiva/30Kgdii/domestic_rabbit_breeds_nz.pdfIn PDF document text
    • http://kzrovk.xyz/sijomafivupamepiv7lql8.pdfIn PDF document text
    • http://ig-mediateam.net/24919494841zj1v4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_5fd8d7d7232f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_60115fc0b0887.pdfIn PDF document text
    • http://ketadiets.site/zobisusosumoxokilazepumomw3w6w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_6007e6718ac13.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/cyVtxic/world_cup_2022_asian_teams.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fda76fb1e9eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_60393aafe1c3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://wutebanik.epizy.com/zidib.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/guide_installation_decodeur_livebox_play.pdfIn PDF document text
    • http://xedoruvuseju.rf.gd/posefabizalesawujuloketis.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/39403557712.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 5568 bytes
SHA-256: c5e76abb118fa191ceca2af0a0fe31b8503eaa33132c9f5862062247b5cdb006
font_01_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 7020 bytes
SHA-256: a79e0960c272845738e7cdae7b364c8d687a1e6f7902690a077071b4411f695f
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 11192 bytes
SHA-256: 1cffdfde2506f46ea120222d458fd65fb1bb7da6783a66062ef0792839ebd747

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