Malicious PDF — malware analysis report

Static analysis result for SHA-256 3253c84d7b46adbb…

MALICIOUS

PDF

75.7 KB Created: 2021-05-19 22:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7aff682b61ee30a5011f7654695010c7 SHA-1: af073eb7305037c10614113e3771166f5c3de84a SHA-256: 3253c84d7b46adbb50be429d2090c2caf4a1a16bd70e519fb94a9d94fdfa5590
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or malicious content delivery attempt. The PDF contains a large number of external links, characteristic of a link farm, with the primary malicious URL being https://xajibur.ru/strik. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests the primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=radicales+alquilo+del+1+al+100 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5ff0d0fbd427e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_604379b1342ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fe6603296521.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/1656572d58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_602496c299e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_5fd927d7a9ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_603fb25b949b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_603c6b264a714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6058e6d2b4f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fd8783f89c8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390641/normal_6002db2034861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502819/normal_5ff6ac0401bfc.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/504311cd7d.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/buguwizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_6022e12b7c4f1.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/sulasatevirexo/lorodipisoxefeki.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/instagram_alpha_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/repojoranofo.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/7629987847.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/vutoxolefotelogazigezopa.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/vijavetosoponenelaxulol.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/buffer_solution_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/business_analysis_diploma_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/breville_je98xl_juicer_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/gisosexivadubakitakapozi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 5164 bytes
SHA-256: 35b7169215871a047a69339d62840317d83027deab4a432c658f13b0a915eb58
font_01_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 11596 bytes
SHA-256: ca7577552b499a4e74ea4e90e1d96ec3148f14925a2ffd180b7c7a4fbf5b61ff

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