Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df033008ba3b676…

MALICIOUS

PDF

66.2 KB Created: 2020-12-21 03:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9d735657d596478f671097ad6fd383c SHA-1: 910d8ef0982007d3d82a4f6ed613df095497e162 SHA-256: 3df033008ba3b676bc78dd4391bd0a700fd3a6ad4c4d053f83ff38ef40bd6b91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=nikon+scope+warranty+repair PDF link annotation
    • https://zukuvexoxowi.weebly.com/uploads/1/3/4/5/134597017/4728698.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/momafimuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_5fb546face6a1.pdfIn PDF document text
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/silemisepal.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/masaw-gijomixedepus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f9f9b7fd713b.pdfIn PDF document text
    • https://xiletepegokif.weebly.com/uploads/1/3/4/3/134319576/5637034.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/119863bc-8715-485b-9e57-f1d90d075dbc/12_angry_men_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567c11d7-11fb-432d-9950-b30b559d2578/19397874652.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfcc855fb7d01a9b0f17d4/t/5fdfee831c66f52f5fae91b5/1608511108639/bozijaweto.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf585f8cdb769c6a8be4e/1606284677927/tipos_de_suelo_en_mexico_por_regiones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c536fdac-7e83-4da6-8513-cb5439b16786/zelapudutalij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656e70cd-ac98-4c68-bdc3-910edd9c5092/42559245208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4054015e-d4b1-42e1-ac4a-3062339d08b7/dodge_ridge_county_jail_inmates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac097bf2-c14c-41e6-9ac9-47f0d50cc58c/36809473248.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_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 5124 bytes
SHA-256: bfaae2e043b29b647032e2618aba66c85c8e5f7d31d875f6f38241ef123ab204
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 10940 bytes
SHA-256: 9bc788310ef048f267f91f962a4bb5857b6b6d7b8dc1529d71eeb0403533da22

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