Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1294a302a539fe…

MALICIOUS

PDF

81.3 KB Created: 2021-01-02 16:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 76356b60e6bbbbf0c37529ca5be9ba2f SHA-1: e4c7274374f7c73bcd492786d7c2b0c734ca6721 SHA-256: 7a1294a302a539fe8e393a66031dad9c75d162e64533faa2fb159929b312cf2c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malicious content delivery mechanism, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/wb?keyword=prison%20break%20season%201%20episode%201%20recap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fdc407231e24.pdfIn PDF document text
    • https://kiwemedorupa.weebly.com/uploads/1/3/4/4/134446537/rukolebavewavetem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5fac299965cfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fe0de9f096bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5faebf84cb943.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/LEhdgHI/double_dragon_trilogy_pc_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/KhdjaWF/94416740051.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/dgelALP/xexawugulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5fcdad680bde1.pdfIn PDF document text
    • https://cdn.sqhk.co/sofopiro/4ibxPii/the_war_for_the_west_free_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5f8ebc204aab1.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/wefadep/shashka_sword_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/33226652636.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/lotopikivimewufujusas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 5292 bytes
SHA-256: e40e1a39b24681f406a626136391aea5cd2c7bb383805876498e09c644d3b316
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 3152 bytes
SHA-256: 8dd908b0e3ca7e91de56331c83b21fd212654840761c6318ae59fb3c56319db5
font_02_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 12180 bytes
SHA-256: 6f05aae6f61efe075bf89572df82971cca65b32e8c0e126b4d8b49c68ea6b7ba
font_03_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 16616 bytes
SHA-256: f445d771a9fddec3a392e932c8a7a35224482514ba01793daefebe06dc746517

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