Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ffc76baa6c6a12…

MALICIOUS

PDF

78.0 KB Created: 2021-02-22 13:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 45b0f16e2ae7796ad21904c68828028d SHA-1: d215b0fd90fc1a43df6b9f2b8096021a94a7946b SHA-256: 98ffc76baa6c6a120e586a2e6863bc1728abd79f716f9598c625f81c563b29ae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the overall structure point towards a malicious document designed to redirect users to harmful sites.

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://druttle.ru/strik?utm_term=dark+blue+dresses+short PDF link annotation
    • http://dezurifu.iblogger.org/5058264542.pdfIn PDF document text
    • http://faketikus.22web.org/disomuta.pdfIn PDF document text
    • http://bekokasutam.22web.org/39513992544.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/hgSlhaB/nilijapixijebujiniseles.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/dZje3Nm/gakavizevitegakipa.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/icjggcD/7725773335.pdfIn PDF document text
    • http://worldhold.online/jajekasuparivakarukegenel9vgb.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/ISjjIgj/damebuliweb.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/fosagoba/11117943773.pdfIn PDF document text
    • http://kobuxotaregudes.rf.gd/lezojamivabopevonisedan.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/nefojef.pdfIn PDF document text
    • http://vefapiba.epizy.com/architectural_review_board_information_technology.pdfIn PDF document text
    • http://julajibumomas.rf.gd/krups_espresso_coffee_maker_manual.pdfIn PDF document text
    • http://goruloloxoz.rf.gd/corporeal_beast_rs3_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/men_s_shoe_size_guide.pdfIn PDF document text
    • http://xuxuxal.epizy.com/9433970089.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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 5116 bytes
SHA-256: ae6af58350a863278f3e4e079a3decf4475ea986a72b38a7436cdc19d5fc2751
font_01_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 11128 bytes
SHA-256: 4d3cc22d602654b60213643e715221e82e9e191714742c7ee3861ff12055e720

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