Malicious PDF — malware analysis report

Static analysis result for SHA-256 08461033c89cf8de…

MALICIOUS

PDF

80.2 KB Created: 2021-04-01 05:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0636d92c9104afde43054f6b537d1897 SHA-1: 90ecffa05c5df1b40e63155053714d58bf26a26b SHA-256: 08461033c89cf8dedf6d7ef67c7d540219ebe43f8fdb7ab39429425b8683fba2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which are part of a link farm designed to direct users to malicious sites. The primary malicious URL identified is https://xezojetit.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=law+dictionary+book+pdf
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/10f7151a5.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6036c10e50bbd.pdf
    • https://cdn-cms.f-static.net/uploads/4376369/normal_6040325064472.pdf
    • https://feruzizujuvete.weebly.com/uploads/1/3/0/7/130775768/98c984f86.pdf
    • https://wodaxudufusan.weebly.com/uploads/1/3/0/8/130814186/domop.pdf
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/d8309.pdf
    • https://fajupumivut.weebly.com/uploads/1/3/4/1/134108914/goxulo_juvax_ginejopipu.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_603aed7a8bbe7.pdf
    • https://dabomisefeb.weebly.com/uploads/1/3/0/7/130775205/c0a97.pdf
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/7557122.pdf
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/towurosu_tekidusaw_danov.pdf
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/4798877.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tipikaxe/what_age_was_leonardo_dicaprio_in_romeo_and_juliet.pdf
    • https://uploads.strikinglycdn.com/files/c5aac9f9-bec5-4491-af62-c52a39b68a93/mopurusosaxexa.pdf
    • https://uploads.strikinglycdn.com/files/3905e465-aead-493a-a25e-6fabeaa3f07c/ficciones_borges_english.pdf
    • https://uploads.strikinglycdn.com/files/bec9cd18-a8a1-471a-9b2e-0245742d9f3e/2003_kawasaki_mojave_250_top_speed.pdf
    • https://uploads.strikinglycdn.com/files/6f084ba9-02fe-4d6b-8dcc-c6381043f432/78459121958.pdf
    • https://uploads.strikinglycdn.com/files/09ec4a15-3097-40f4-b502-5ca8fd604b1a/65550322607.pdf
    • https://uploads.strikinglycdn.com/files/45414ccb-f7b5-4354-b2e1-55ffd7ad41d4/rurirafoparusitosex.pdf
    • https://uploads.strikinglycdn.com/files/71e1649d-85f4-487c-9e13-f0f80a2b1f48/ar_15_parts_diagram_printable.pdf
    • https://s3.amazonaws.com/bubeto/vefomogakasivozefumunu.pdf
    • https://s3.amazonaws.com/laginekux/34363197898.pdf
    • https://s3.amazonaws.com/vonusirukete/26217331606.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_off0000fd49.bin
2982eea3ed5d2a3ea0727abb34cee34a78211bbe64c65b153cc235620432e1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 5280 bytes
font_01_sfnt_off00010f6f.bin
b75c664b063eb50947d56e7c76a522a09c8bd8257f39585b20fd892221ebe5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 10612 bytes

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