Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f74cecf779041db…

MALICIOUS

PDF

72.0 KB Created: 2021-01-14 20:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 22861764d1ce5e8f4b3dda23a24b27d0 SHA-1: 9d51ecbd81a56169e3a7c7c23622254ab2c84962 SHA-256: 8f74cecf779041dba4945c6813d79e6916845c6ca3cbc82aaa4c5cf95c560002
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=ultimate+nintendo+guide+to+the+snes+library+download PDF link annotation
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/7d15fca9a20bbb.pdfIn PDF document text
    • https://site-1177495.mozfiles.com/files/1177495/32524148467.pdfIn PDF document text
    • https://site-1172508.mozfiles.com/files/1172508/atomas_game_pc.pdfIn PDF document text
    • https://site-1204104.mozfiles.com/files/1204104/kolotimovusit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_5fd1abdfd425d.pdfIn PDF document text
    • https://site-1177407.mozfiles.com/files/1177407/39214224965.pdfIn PDF document text
    • https://notagudoda.weebly.com/uploads/1/3/0/7/130776089/802a466cef3e48b.pdfIn PDF document text
    • https://site-1176298.mozfiles.com/files/1176298/55036696315.pdfIn PDF document text
    • https://site-1177680.mozfiles.com/files/1177680/24699004865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fab8153662ff.pdfIn PDF document text
    • https://site-1178634.mozfiles.com/files/1178634/pocket_staff_amazon__co__uk.pdfIn PDF document text
    • https://site-1173368.mozfiles.com/files/1173368/46633433850.pdfIn PDF document text
    • https://site-1172701.mozfiles.com/files/1172701/70202583544.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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 5564 bytes
SHA-256: 3aacacb9c3872ce32b27251cbbc902cb0207618e8c885ad2218d8f03c1e13897
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10740 bytes
SHA-256: 998cbea59986e272edcc22b767311d22b87eccd87c8170f3b1b83898fa7f3ef7

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