Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e31eacc5c4ce039…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 20:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0af856afd2682cbcdc04c659e664cd2b SHA-1: 265ee8499e36f5f3f93f1757f89fcb9f2d01c04e SHA-256: 4e31eacc5c4ce0395bbc4470a5789acd6186269f79b678ddc6e7c179bb7f1cd2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms used in phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary URL, dugedepap.ru, is suspicious and likely serves as a redirect to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=how+to+setup+your+xfinity+remote+to+your+cable+box PDF link annotation
    • http://consumer-data-protection-bureau.com/60225666947bd8la.pdfIn PDF document text
    • http://how2clever.com/the_hurt_locker_1080p_megakfvtj.pdfIn PDF document text
    • http://pasetbs.xyz/cowon_plenue_d2_specifications21o6m.pdfIn PDF document text
    • http://fridgeservice.ru/the_little_prince_full_story_by_antoine_de_saint_exuperyuorvf.pdfIn PDF document text
    • http://jerevuxo.iblogger.org/29698040312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_74bc1675fd434fd9a4b029be38d430f2.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_e190beb58f2d481ea11298c7a9e7bf4a.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_e204097e25fa4aaf9e1cd82aa315aff1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/vebape.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_be5383e4938344c9a2d444ef58af4b81.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_0df35d5c2b4143c5919c64efab57f8fd.pdf?index=trueIn PDF document text
    • http://zorufuzelal.rf.gd/xibola.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_82f1ba2c383d4ce9864c83b6370a9b24.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_9526705809fd4554a354098836fbb1b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/26337220149.pdfIn PDF document text
    • http://simolerifape.epizy.com/aws_cli_cloudformation_deploy_s3.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_d3146e5ff2c24282a708830b1d89f40b.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_dd6e95baa67141fb8fa0815f1102e832.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_c4f3f46b1ec94f158623db14f3a50fcd.pdf?index=trueIn PDF document text
    • http://dugubokig.rf.gd/renadeduzujowirexofizaba.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_abe583d85a1b43dc84a93eba12b443a0.pdf?index=trueIn 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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 5524 bytes
SHA-256: 525bd6c4a032340bf707c7598b95d71f941aa09698abbec7a821e4a03670d88b
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10280 bytes
SHA-256: aee37ecbee213329d541cafddca96924f9059cdd3519fb2ae7df5a97b7439dc2