Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe4077a40b73fd9…

MALICIOUS

PDF

68.5 KB Created: 2021-01-17 20:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7c853c356004ca50046369742a1fcd74 SHA-1: 79b6d2b5ca68c5ef467edaeae1169024060def52 SHA-256: afe4077a40b73fd9bdb37b1f6a9866758e5f3d675e9333faff5c80d16503dd6f
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 large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in malicious documents designed to lure users to malicious sites.

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://trafffi.ru/123?utm_term=nintendo+switch+tablet+mode PDF link annotation
    • https://cdn.sqhk.co/pigalixow/tDoijgj/73332184374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f893e4673984.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/hgiohof/93509977212.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/9jfTgjU/diamond_pickaxe_minecraft_png.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fa1b8e0e767c.pdfIn PDF document text
    • https://site-1244719.mozfiles.com/files/1244719/reduced_relative_clause_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fa79eafbe604.pdfIn PDF document text
    • https://xeluxujuw.weebly.com/uploads/1/3/4/4/134438775/1727849.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/6879938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5ff392777fcbc.pdfIn PDF document text
    • https://togolotokafusaf.weebly.com/uploads/1/3/5/2/135294136/pugaluzel.pdfIn PDF document text
    • https://site-1174394.mozfiles.com/files/1174394/moto_racing_mania_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/e23ZOhh/95099839847.pdfIn PDF document text
    • https://site-1198442.mozfiles.com/files/1198442/tojiwopef.pdfIn PDF document text
    • https://site-1167973.mozfiles.com/files/1167973/27638512900.pdfIn PDF document text
    • https://lefofikik.weebly.com/uploads/1/3/5/3/135316562/fbca62463fb3.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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 5284 bytes
SHA-256: 351e20cdcb80857b1991f322e6416465400b19595893440b1029e74460fac40d
font_01_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 10244 bytes
SHA-256: 40891de3c404feb7539ad7595d1fa345df40ddeaf9693a0f302e0c978d42e632

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