Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1af7110e206e22…

MALICIOUS

PDF

80.9 KB Created: 2020-12-25 09:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4337cf944781b0f3b38d21934b3dd358 SHA-1: 9f8091a1990038e7c3b4a81a1d13d8f5d0e868db SHA-256: 3b1af7110e206e222aef9f4ab3d1a4a4ea7ac79e0d03b3233b9e37a59d29249c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent link pointing to 'trafftec.ru', suggesting it functions as a phishing lure or a gateway to further malicious content. The presence of external links and the overall structure align with a spearphishing attachment attack.

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://trafftec.ru/123?utm_term=wow+classic+warlock+minion+guide PDF link annotation
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/movutomu-koberu-bifagefare-bimimepaxos.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/vewavajuvimuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f911f8c1cc00.pdfIn PDF document text
    • https://xemivigezeb.weebly.com/uploads/1/3/4/4/134481563/sikalosiletepaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/0yicNjj/mozom.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/34c944c6ccc0167.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/hejgKie/1242286337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f8eb4465e49b.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/xovekolamoxe/bebudulanigovox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e3e8c2-c3b2-455a-aacb-ac9d170f4234/ribomafukutimova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ed7fe4-443f-48e5-bf58-ba72380c15c2/jigifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a889821a-834a-48ee-a533-dd35827a3447/valabekosovines.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/autoestima_conceptos.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/attitude_and_behaviour_in_psychology.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_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 5428 bytes
SHA-256: afc5208f0f5d090c154e4766e7cc07132d6819a2687f518c2f729bdf85d0c355
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 11624 bytes
SHA-256: 4ba1b40b001018ef80174e62e50ea33c5a77827733505543f17dedc46fd71c5b

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