Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea21c8cc0f891ea9…

MALICIOUS

PDF

79.8 KB Created: 2020-12-17 10:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76820eadb459c39c55190bba9078f96f SHA-1: 1c7dfa083cfab0cd62675036703bdc9d2ad6e5a5 SHA-256: ea21c8cc0f891ea92e542745f49eb522d7d1b954ab6c7b3de907fd838d39ad32
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF SEO link farm, suggesting a tactic to manipulate search engine rankings or distribute malicious content. The heuristic 'SE_CLICKFIX' indicates the document may also attempt to trick users into executing commands directly, further supporting a malicious intent. No scripts were extracted, but the presence of numerous external links and the social engineering heuristic point towards a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=pathfinder+spider+silk+bodysuit
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5f957406a67ef.pdf
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd160df87557.pdf
    • https://cdn-cms.f-static.net/uploads/4529977/normal_5fdad12eaf745.pdf
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fa35c7614e90.pdf
    • https://cdn-cms.f-static.net/uploads/4403270/normal_5f96f47507c1a.pdf
    • https://dewubolisevibe.weebly.com/uploads/1/3/4/3/134318954/dukuruz.pdf
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/192946.pdf
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/17623a72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cfa08de8-e5b7-4aca-8776-1f4cea23ca9c/monitor_gwg_oder_anlagevermgen.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/driver_bematech_mp-_4200_th_64_bits.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d571.bin
3ecd3d12c3931ff71b9d1a08201dc4dad5da2d1df9eff00dcf7fb71ea50d1bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 7700 bytes
font_01_sfnt_off0000ef37.bin
6e75ff318f4b2d6c357b52637a338d2868030571420b4012d58e6226170f5a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 5320 bytes
font_02_sfnt_off00010133.bin
a2339934ce0b47c6f56d0c2a0679c5225df754acee7619260ab838f551429dc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 10372 bytes
font_03_sfnt_off0001242d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 4324 bytes

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