Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30a27c6192a6351…

MALICIOUS

PDF

83.0 KB Created: 2021-01-01 09:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8a7ab0e9bb0efcd70cd7be76d9cd1c11 SHA-1: 7c23cb48e8273e89d7985dce927d793ff8fc5aa2 SHA-256: a30a27c6192a63510c8d3df399e2731e3127d7cc7f219d3f7d6eef55ed034265
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of SEO link farming, with the primary malicious URL being 'https://trafficel.ru/123?utm_term=game+of+thrones+cookbook+reddit'. This suggests the document is designed to drive traffic to malicious sites under the guise of relevant search results. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafficel.ru/123?utm_term=game+of+thrones+cookbook+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f9f0e13c7561.pdfIn PDF document text
    • https://tubuzitobez.weebly.com/uploads/1/3/4/1/134108618/335ce.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/9456874.pdfIn PDF document text
    • https://gavuzamamezi.weebly.com/uploads/1/3/4/5/134590232/2a7b24c2c.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/vesikowobup.pdfIn PDF document text
    • https://jololese.weebly.com/uploads/1/3/4/5/134599323/sarosajajoxupa-bakorela-wuzodaki-bapoke.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/2318499.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/5573902.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/bikikanafopavu/42345757115.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/zapawiwurapobevota.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/arte_surrealista.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/problem_solving_strategies_math.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/calc_series_cheat_sheet.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_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 5464 bytes
SHA-256: ee6718cc59eec3bf5999a816a026ffaa279bd2493e7e4747cacb791754dd99aa
font_01_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 11344 bytes
SHA-256: 76deaf6edad2e29ab0e14402bc4ffd7b86b694c8daa1648b128afd6452f558d0

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