Malicious PDF — malware analysis report

Static analysis result for SHA-256 342acfc2e9c8c3aa…

MALICIOUS

PDF

69.6 KB Created: 2021-02-21 15:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e117feee96b461729707ad9c5aca0db8 SHA-1: d178361541830956a22ff3b074ba93512092ea7d SHA-256: 342acfc2e9c8c3aac1db91ceb8c7855533f4da72601e7c2efcf48f52f789035a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious 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://maypoin.ru/strik?utm_term=what+order+to+read+the+100+books PDF link annotation
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/9386514.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/t9cjjjh/heart_rate_app_free_download_for_android.pdfIn PDF document text
    • http://websporizlehd.com/midixeliwexmmo6t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_601dd679780f5.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/icXggib/dragon_hunter_orchestra_cello.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/envision_florida_algebra_2_teaching_resourcesk4swu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ff3f55d04cb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_600809959f13d.pdfIn PDF document text
    • http://kittyplay.online/free_messenger_app_latest_versionms1a0.pdfIn PDF document text
    • http://petersikdar.com/the_lover_duras_goodreadstwqy7.pdfIn PDF document text
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/a838ce66dd3bce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5fe76ff2b03fa.pdfIn PDF document text
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/bdca4a5d297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_6024ae693c69d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_600819c85dab9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 5292 bytes
SHA-256: ad92a3c5a979d05ec070f1b0020a5e250c750716a47e18d5d3e6ff3069b7966f
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 10012 bytes
SHA-256: 81da10520b24df769be376cc8b080222c7daa7f6afb5ea17c6129c04c09283ee

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