Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce181a614e3b412…

MALICIOUS

PDF

80.7 KB Created: 2021-05-24 17:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 919186de176347ba5b8fa17ad1e1d209 SHA-1: 7287f65de7d820304e08a76c6155c902177429a5 SHA-256: 2ce181a614e3b41243e2b881a4477a7112f71028e37ff54c32d4e45555465c49
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or redirection scheme. The primary URL, https://botokaw.ru/strik, appears to be a lure for a game, likely to disguise malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://botokaw.ru/strik?utm_term=surviv.io+battle+royale+unblocked
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/9181296.pdf
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/wiposefogo_kedosumulawe_tebivokumul.pdf
    • https://cdn-cms.f-static.net/uploads/4366327/normal_605664035f5df.pdf
    • https://zixulelivu.weebly.com/uploads/1/3/4/5/134507035/1006532.pdf
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5ff81372e3803.pdf
    • https://static.s123-cdn-static.com/uploads/4386095/normal_5feeb3cfe4f41.pdf
    • https://guvidojovutubev.weebly.com/uploads/1/3/4/6/134697602/sosimob.pdf
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5fde73f07ce91.pdf
    • https://cdn-cms.f-static.net/uploads/4460723/normal_60201f5367722.pdf
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/9018417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/davawina/farigubulap.pdf
    • https://uploads.strikinglycdn.com/files/bddea7ce-26b8-4e3c-8cd0-430031256b5a/95359036600.pdf
    • https://s3.amazonaws.com/kuboki/87324333658.pdf
    • https://s3.amazonaws.com/gulapore/6168043197.pdf
    • https://uploads.strikinglycdn.com/files/030c0cb5-5d4b-467b-bc6e-bd03b369a391/gefezege.pdf
    • https://s3.amazonaws.com/jevelel/kuremonaretavovevamipazi.pdf
    • https://s3.amazonaws.com/resixexi/87624781941.pdf
    • https://s3.amazonaws.com/pulujolatepuv/mercruiser_3.0_tks_service_manual.pdf
    • https://s3.amazonaws.com/xasovewipeje/quran_english_pronunciation.pdf
    • https://uploads.strikinglycdn.com/files/6f8ad7d5-f56a-4a54-9fcc-e775df23cc9b/xudifaluterer.pdf
    • https://s3.amazonaws.com/kibavutibeved/lisuneso.pdf
    • https://s3.amazonaws.com/xarojapi/83785158750.pdf
    • https://s3.amazonaws.com/bejenosugede/swann_security_camera_power_supply.pdf
    • https://s3.amazonaws.com/nufidibodudulad/arbily_t8_manual.pdf
    • https://s3.amazonaws.com/wekibik/c_11_using_template_function.pdf
    • https://s3.amazonaws.com/gotijejaj/96844517635.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_off0000f9fb.bin
8c1395b78048ccd6860a2c873fe7b77872dcc7472d2b471b047f20c536314978
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 5256 bytes
font_01_sfnt_off00010bfe.bin
90d152d51c92e4c407388661587eb3e96d7e41cc40c061e3fb832f133f27fb5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 12016 bytes