Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb34467b04b4b2e…

MALICIOUS

PDF

88.8 KB Created: 2021-04-04 05:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cb42ccbf30e2f59515950fcc2589f430 SHA-1: 534bce45b66aadf6a8819671c11cb7e4b90e02ce SHA-256: 4eb34467b04b4b2e0736929ea229c2560e45cefd26022bc7c552ed2912348c6a
156 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 of which are SEO-optimized and point to other PDF documents, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://golowaki.ru/strik?utm_term=multiwii+wingui+2.4+download', is presented as a download link, indicating a potential lure for users seeking software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=multiwii+wingui+2.4+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408481/normal_6062ebd08e309.pdfIn PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/4344265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5fc8c1bf29b53.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/kabewedusevufuxexag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476943/normal_5ffac13c2a24f.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/2113119.pdfIn PDF document text
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/87fb7b.pdfIn PDF document text
    • http://memisada.mygamesonline.org/agile_scrum_project_management.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/percent_composition_practice_worksheet_with_answers.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/xewamejixolefaj/johnson_25_hp_electric_starter_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/panasonic_viera_50_inch_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/casio_sea_pathfinder_watch_2572_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/notanu.pdfIn PDF document text
    • http://lebusepuwiri.atwebpages.com/telufisabobol.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/autonics_push_button.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/how_to_open_3m_steri_strips.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/15113911217.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/78983800499.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/xixekejaxexazunujexezom.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_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 5068 bytes
SHA-256: 179428cc33d1c15a87e81e3dfb6c84e3682df229f1f476fd1f68713529390e86
font_01_sfnt_off00012c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C95 12212 bytes
SHA-256: 4e94941421524cad1da70634248afb4ff0992a98dbca5f39d7a988947d9d4350

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