Malicious PDF — malware analysis report

Static analysis result for SHA-256 44790c537e6b4581…

MALICIOUS

PDF

69.1 KB Created: 2020-12-16 18:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd0f4532bf9637d3a18a231c3308f73e SHA-1: 1982e98a3b8cab01942b45fe939f6ce841a828b9 SHA-256: 44790c537e6b45811e1aff21e4ff7ccef687959903484a03b0877cf19add5d28
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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/strik?utm_term=fryman+canyon+hike+length
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/gerejitoke-xaramoniripub-gedizilekuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc580655e8e827d42ad0269/t/5fcd09bc260a660a6bdf4afe/1607272893250/fire_flying_dragon_simulator_warrior_sky_rider_3d.pdf
    • https://static1.squarespace.com/static/5fc5b3eee5c7695ca9bc5168/t/5fcfda7c51e8cf16f083aeef/1607457404450/21466544564.pdf
    • https://static1.squarespace.com/static/5fce48d52cf4ad19c3ac5f73/t/5fd72c5c9264095525ed8a48/1607937117344/feduzeba.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeffb3570fb44d1c82464/1606283260065/vezilagojogabonawaba.pdf
    • https://uploads.strikinglycdn.com/files/6d6fee89-71ce-43e3-ac75-6acfbebefeb7/nagezigijukidagisoxate.pdf
    • https://uploads.strikinglycdn.com/files/b9bdfc5b-bfd6-463a-aa76-4802b2b3bdbf/torres_martinez_tribal_tanf_thermal.pdf
    • https://static1.squarespace.com/static/5fc3ab40bdb33045eed37d5e/t/5fcb6ea41415195da08554fc/1607167652478/86943771618.pdf
    • https://s3.amazonaws.com/mejawiwomak/67306505263.pdf
    • https://s3.amazonaws.com/davawina/gadozijonujozuba.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b2.bin
70569ac25133721e85e48ee470d7cf67cdd6000c9e8df13809e11d190be3541c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 5156 bytes
font_01_sfnt_off0000e51d.bin
e33ccffae291d28a8a0881bf43048d1131f30d7f23370c76b594099be3ecda63
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 10368 bytes