Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a98c3700d717909…

MALICIOUS

PDF

89.3 KB Created: 2020-12-10 14:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 981baef3cfd41d1de4586f5e4d7bc495 SHA-1: de39aaf20d3948e1ce169e77711512a79cc30dd4 SHA-256: 7a98c3700d717909cf471639ace339ce0fd82fce10123776f81121e41a8e853c
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or spamming operation. One of the primary external URIs points to 'https://trafficel.ru/strik?utm_term=hail+storm+dallas+tx'. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trafficel.ru/strik?utm_term=hail+storm+dallas+tx
    • https://cdn-cms.f-static.net/uploads/4418574/normal_5f99b42cc7376.pdf
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fbd5b2884ec1.pdf
    • https://cdn-cms.f-static.net/uploads/4413467/normal_5fd17e174e603.pdf
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/novaw-kezomebebudo-lojosetobafabun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bb2a5eca-c06a-4787-ab68-e70865b720cc/dragonball_z_mugen_download.pdf
    • https://s3.amazonaws.com/nafibanefexex/what_is_google_docs_forms.pdf
    • https://uploads.strikinglycdn.com/files/573aa25b-85d2-452d-aee4-62888b5fe437/silipuze.pdf
    • https://uploads.strikinglycdn.com/files/ac55429b-d73d-47ed-a9c3-a7521546c0b7/89357119512.pdf
    • https://uploads.strikinglycdn.com/files/2a3b1e24-bced-4aa7-a50c-8d2050669e9c/gallop_and_ride_wii.pdf
    • https://uploads.strikinglycdn.com/files/67ff6855-3b5b-479a-8e7e-af1061b42934/fufexajanafukeniwete.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_off0000fef3.bin
44dbf81e06231f73f2c0ee9e9c9268e3ff46f98a16b242783d55ac26b55743bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 6284 bytes
font_01_sfnt_off0001149b.bin
48e5c4ea117a6345ba5a0ee24fb1cf93214873ad9934754794046d8be659dd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 4564 bytes
font_02_sfnt_off0001240b.bin
3a90481a30dc1a2e0ed9b3d33e9d7f072b9f1a93829102d478b70129c93dd268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 11184 bytes
font_03_sfnt_off00014a02.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A02 4324 bytes

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