Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb07a32503a2a77…

MALICIOUS

PDF

76.5 KB Created: 2021-01-14 04:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9128cc38ea7b35ad9b0e934155a84a42 SHA-1: 9cb3429201236f6b3ded55c3de23bc6046476c5e SHA-256: 4fb07a32503a2a771fc1765ae33dd4bf595b12474b5962ef3bc013d88cc154c3
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 heuristics indicating it is part of a link farm designed to redirect users to external sites, with one URL explicitly mentioning a 'pokemon official game for android' lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://traffnew.ru/aws?utm_term=pokemon+official+game+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406228/normal_5fa16f3c5804a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5fad9aed40f42.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/estreimiento_cronico_funcional.pdfIn PDF document text
    • https://site-1211863.mozfiles.com/files/1211863/vepomixumufokodewabovi.pdfIn PDF document text
    • https://site-1179057.mozfiles.com/files/1179057/chinese_visa_uk_application_form.pdfIn PDF document text
    • https://site-1175229.mozfiles.com/files/1175229/kaiser_flu_shot_santa_clara_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fd5fbaf13aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_5fb40184bc8a4.pdfIn PDF document text
    • https://site-1175166.mozfiles.com/files/1175166/legafera.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/5459371.pdfIn PDF document text
    • https://site-1168340.mozfiles.com/files/1168340/fax_cover_sheet_template_google_docs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_5fabca4e3a13e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_5ff42c0ff2eaf.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/bidivo/dabamawugevogusudutub.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5228 bytes
SHA-256: a87f03ff0b7949be9b40bb29914a20efb44975a8282394d73b0fd80cf41d3ece
font_01_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 10784 bytes
SHA-256: 64e3f0b2474b2fc5c7f347984c4c247ce255afe9f2453fe9481a51ea6caa95b7

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