Malicious PDF — malware analysis report

Static analysis result for SHA-256 788ea7a89854c410…

MALICIOUS

PDF

92.6 KB Created: 2021-02-08 22:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b01a0d491a4c8b559d210d5add748a0d SHA-1: e72b597d4e704955f43cd25c8f1e3d8140194680 SHA-256: 788ea7a89854c410afa8bbd008266b297eee2e33c0f6264915a7eb6b735258c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://bologen.ru/123?utm_term=swtor+arsenal+merc+pvp+guide PDF link annotation
    • https://cdn.sqhk.co/voguzasijur/ijghagh/online_backup_storage_server.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/hfSji9R/85896410583.pdfIn PDF document text
    • https://cdn.sqhk.co/nolugavetiri/hbjdIAW/50762093521.pdfIn PDF document text
    • http://datujizid.iblogger.org/relikifiboloro.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/mimuzalupi1trhe.pdfIn PDF document text
    • http://ukranews.icu/mtn_momo_agent_nigerianw0jb.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/convert_base64_to_image_in_react_nativeiq3ij.pdfIn PDF document text
    • http://secret-empire.ru/pemeriksaan_coombs_testxozp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_601fafecca817.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/162fe0.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/vigorhb/zijetubizutozukake.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/dhchhgi/smart_and_final_fresno_ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudozam.epizy.com/nice_guidelines_for_management_of_diabetes_mellitus.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/kixaf.pdfIn PDF document text
    • http://vaxutusurinav.epizy.com/alejandro_magno_biografia.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_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 5648 bytes
SHA-256: d9e9e1c25b7bd3cf1fc2f16e4550d05d70fe191125c78543fd688e61269dfcf5
font_01_sfnt_off00013e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 11596 bytes
SHA-256: 5522857af1a56a9185e063f082a376f479e602ca75aa3ba7637b2d95ec989afa

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