Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf3798c1d0c0f25…

MALICIOUS

PDF

78.5 KB Created: 2021-01-03 07:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 96159ea9cbb3504e9cf6876a2fe627fe SHA-1: bb613c5b976ef29fb2ac837f9e3326fabe3fe5d4 SHA-256: daf3798c1d0c0f256068e8fffed46daafc648dcc8fecaa05b608351b1936bea6
186 Risk Score

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, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

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
  • 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://trafffe.ru/123?utm_term=rotmg+leveling+guide PDF link annotation
    • https://podetixado.weebly.com/uploads/1/3/0/7/130739559/dosazewixe-kiwisup-repopefoxoj-kiwupolaniroba.pdfIn PDF document text
    • https://fefupitemoxawa.weebly.com/uploads/1/3/4/4/134480784/joxabugu_roxamikabe.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/eerhdjb/muwekodome.pdfIn PDF document text
    • https://ketokaxuvora.weebly.com/uploads/1/3/1/8/131856042/7572688.pdfIn PDF document text
    • https://gegiritofizupog.weebly.com/uploads/1/3/4/6/134644009/b575c5477376887.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/muzaxovimibuf.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/ee27b50c64faae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5f9ba861db21f.pdfIn PDF document text
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/lowiwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37527ebc-a328-49c0-80fa-539319f1af19/kimimamux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b24d7d-6ea0-4c09-a732-1523dfaefd66/42770757942.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 11236 bytes
SHA-256: 90e4ba991b1ffea85999d1914cf71865b659c176f5cf3d3f812f850204b98733
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 4728 bytes
SHA-256: ec4bd514c51d195dde940343bb097957c7256825e36e0f3e3560af256f2e3ebf
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10352 bytes
SHA-256: 89d8e5b22718c483b9e149473a9d0f4640d528d7ac558e8d35803f9057afa517

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