Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec318c751ec2adfb…

MALICIOUS

PDF

93.4 KB Created: 2021-01-16 12:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ecd61a793928611f00d1c862e0827c7c SHA-1: 7bf9e6c8fca269486713774ae58fcffcc4645efe SHA-256: ec318c751ec2adfb49efaf924f96411482bc75a8adcb5d080fd1659a189abd59
244 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 significant number of embedded URLs, many pointing to disposable hosting services, indicating it functions as a link farm. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest this PDF is part of a campaign to redirect users to potentially malicious or unwanted content, possibly for SEO manipulation or phishing. No scripts were extracted, but the primary attack pattern is the distribution of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=huffy+coaster+brake+assembly In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_5fbd2bad843b3.pdfIn PDF document text
    • https://ribufesoguvas.weebly.com/uploads/1/3/4/6/134680119/2598792.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/zevurudigifud_xipeti_kofasosakix.pdfIn PDF document text
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/jojopixonap-vesewewonowebez-fetopulak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387573/normal_5ffe0a0589a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5fae268431e23.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/gifgdsJ/pelupogovetejojazakev.pdfIn PDF document text
    • https://lidusibujoxoxo.weebly.com/uploads/1/3/4/5/134500869/maxofuda.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/6196229.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/leteraxewe/50802855560.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/10017312784.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_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 5296 bytes
SHA-256: c98a418c13b392f50aae4b8d12f98bae1f39d6eb66f3f8c1fac31b7cbb2af2bf
font_01_sfnt_off000142aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AA 11044 bytes
SHA-256: 608e133540ee73f050a61aa61585c237b73271e527da43a60cfc339b3cd33d47

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