Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ba98ee7c96202b…

MALICIOUS

PDF

71.3 KB Created: 2021-06-12 05:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46922331b279499d46e8751c696aedd SHA-1: 66eea8b73e0dc239db7b5e8b7a9745843e436df1 SHA-256: c1ba98ee7c96202bd5e16cab90c13423390b0be1d8046c2023e196bd26a2f6da
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'Australian shepherd puppies blue eyes'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV and ML detections, strongly indicates malicious intent. The primary function appears to be redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cructi.ru/pbw?utm_term=australian+shepherd+puppies+blue+eyes
    • https://zoperugojoboriv.weebly.com/uploads/1/3/1/3/131379643/xesewe.pdf
    • https://begiruxuvasepi.weebly.com/uploads/1/3/5/3/135351124/vunum_wolimonev.pdf
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/c5b46.pdf
    • https://janikopet.weebly.com/uploads/1/3/4/6/134690806/losilatinufi.pdf
    • https://static.s123-cdn-static-d.com/uploads/4369766/normal_60b4ceb396c46.pdf
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/7313898.pdf
    • https://kepowawovexe.weebly.com/uploads/1/3/4/0/134016687/nadariboriw-nadugamugunom-watixug-vepogole.pdf
    • https://cdn-cms.f-static.net/uploads/4502464/normal_606a50197966a.pdf
    • https://static.s123-cdn-static.com/uploads/4421464/normal_6001c24e42002.pdf
    • https://cdn-cms.f-static.net/uploads/4451766/normal_605d98eebd39b.pdf
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/birura.pdf
    • https://cdn-cms.f-static.net/uploads/4456685/normal_6060fb5db6000.pdf
    • https://gixodavo.weebly.com/uploads/1/3/4/6/134632057/gejerinorolel-nubefuvemomugep-kagumolisani-vakibaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ceb57be3-9616-479a-8c96-e4f528527fe0/mr_heater_big_buddy_canada.pdf
    • http://kalunagepigi.pbworks.com/f/samsung_galaxy_tab_a7_tablet_manual.pdf
    • http://jotoxipigi.pbworks.com/f/xaminafafel.pdf
    • https://uploads.strikinglycdn.com/files/c414784c-8c73-4e86-9a20-0e47594c6a6f/spanish_2_textbook_answers.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_off0000da51.bin
6ddd5c45373d4dc243444a0e963f71466ebc30ef025197262e1171a767cbcdaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 5276 bytes
font_01_sfnt_off0000ec37.bin
444905a5fdbf79ddbef84a1e1fabefbd2ca1b55bdf1d92ba60dd71ffc9e5aa21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 10484 bytes

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