Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8c97638aab6823…

MALICIOUS

PDF

64.0 KB Created: 2020-11-16 23:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0fc0ca80eb0f3f608b160b025fa2048d SHA-1: 33f62d884c948d79f3f8d14b89bd8416d1dab911 SHA-256: 5d8c97638aab68236cebb3d7070beed81f20ec6b102004c17fda286583913b4b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=in+another+country PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f93cad4b180c.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/zamofoxev.pdfIn PDF document text
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/7361333.pdfIn PDF document text
    • https://mesovozilepako.weebly.com/uploads/1/3/4/5/134588792/2712136.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/3543b66883e75f.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/jirejuxez.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/2940d4cf-6430-4e52-8165-9b26d5a76948/13583794309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cf6d29-98cd-4d77-ae5c-9c4b48283119/96131191779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6799a2b-d76d-4c4e-ad18-dd73a8542978/fundamentals_of_educational_research.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/explain_why_all_mutations_are_not_necessarily_harmful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55b9e62-c9f2-48cd-82f5-0849c709edd6/57847159102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427bb853-04d6-4b8d-96f2-b43703975c6b/tisaxuxozaruwan.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_off0000c088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC088 4716 bytes
SHA-256: a38892426613bb922771432b203a9d76ef931fff00c4d81db1c83a90c67c2a30
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 10372 bytes
SHA-256: 95b96f0d4c1be110e2abb198b80c918eeb0efdabdcb937ef5d16674b624f73c1

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