Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e6749f58d3fd7a…

MALICIOUS

PDF

67.8 KB Created: 2020-11-12 23:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a0606db12bccfed808d88e759bb8b546 SHA-1: 9d296d68ad5bdd09b08708d2575cf08c3870f2f5 SHA-256: c9e6749f58d3fd7a34b121cb329937f7a019693549ccba1e5b086cf757ddee0d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://traffnew.ru/123?utm_term=escalon+sportsman+club+membership PDF link annotation
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/zuwosokofibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f9271e929848.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/116706a222a9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f91a7a6c7bc0.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/32708f917bd167e.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/nibelebisupozuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f8dfc3e46a5e.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/ae008302e15cf6b.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/7581627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/17c089ee-8638-465a-8514-32ee3758e4bd/46903487723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0810d89c-661c-4ef8-a859-274314e7bff5/farm_lessons_porn_comic.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/haydn_trumpet_concerto_in_eb_sheet_music.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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 5152 bytes
SHA-256: ee07898196600546cc6e97cb0cf348472953f75809225dfe27f0bb5eb1d1cbfd
font_01_sfnt_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 11548 bytes
SHA-256: 08dd6713937777acf1b9d8bc50906751864e45482e16ab6367b59f882ad6a500
font_02_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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