Malicious PDF — malware analysis report

Static analysis result for SHA-256 6278f3fca23ed47e…

MALICIOUS

PDF

81.4 KB Created: 2020-11-25 16:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e6dfd38be383455c21f0b174b1bd98de SHA-1: 7552fc3a1c4d320cf74c5dc7cd607b7b15f03ca1 SHA-256: 6278f3fca23ed47e046b3af7e7cc40a1dcafb58b06525a691f3cd07ea191bd09
214 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to redirector infrastructure and link farms, indicating a phishing or malicious redirection attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. Although no scripts were directly extracted, the nature of the embedded links and the ClamAV detection as 'Pdf.Phishing.Trojan' point towards a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=rising+action+of+hunger+games+catching+fire In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5faae9480578c.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_5fa0001d2b42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f8be007637eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5fa44d951359f.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/rujimidujek/dowegobo.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/new_dj_song_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/38274373743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7947bcb-5574-47c8-ac0b-7e99e69abc64/cypress_hill_discography_torrent.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/56960907538.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_off0000c149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC149 18500 bytes
SHA-256: fc87434151115cdadaed91be94aef544b861ad055cae2dd0483d7a4b65895d2f
font_01_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 5272 bytes
SHA-256: 9738b91c3457fbd9986ce18712a5d53c551ef434f938d67987308dda3c87bf1c
font_02_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 14388 bytes
SHA-256: dfc567f1681061b83cb8ab379c56885f005638167d962202f3a56901febc42fb

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