Malicious PDF — malware analysis report

Static analysis result for SHA-256 66de35d05b59a6da…

MALICIOUS

PDF

76.5 KB Created: 2021-02-27 17:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 05e8125501266cbd6484be0548e2e2ea SHA-1: 25ba32d73e01cae20b548d6e1d18e4147909a125 SHA-256: 66de35d05b59a6da01b1e3fde236483516f8d8f22147aea9dafd3262f399ada9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=used+briggs+%2526+stratton+vanguard+engines+for+sale PDF link annotation
    • https://cdn.sqhk.co/jubawiwa/ycZwwje/98498676451.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/e4hd8ge/fisulafasegawogemugaduwen.pdfIn PDF document text
    • http://cccckkkkkdd.space/rug_carpet_3d_model_free_downloada2a7b.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/VhfcQig/33421429122.pdfIn PDF document text
    • http://dofukatejipoz.66ghz.com/bodhi_linux_5._0.pdfIn PDF document text
    • https://kenumobubedu.weebly.com/uploads/1/3/4/3/134370592/2920776.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/aicrghK/download_bubble_wings_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/7Kjcfgj/support_local_businesses_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/jhiaYpn/video_viral_de_dreams.pdfIn PDF document text
    • http://bionatur.space/50027078005dx40a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemireme.epizy.com/tuwuxujip.pdfIn PDF document text
    • http://vabopegimunufet.rf.gd/95674867851.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/jegosevitusilaloniporites.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/refuwere.pdfIn PDF document text
    • http://babefuv.epizy.com/5555135960.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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 4880 bytes
SHA-256: a7bc3e1f58cfb2d69249eb1cf5049aa39522a584bb86382ec3a7564b11c9f312
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10640 bytes
SHA-256: ffa41caf47e56a0b7d7216916198b54b35ebfcb8561529eefa01a13c734d217b

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