Malicious PDF — malware analysis report

Static analysis result for SHA-256 9013ac4db525ecdc…

MALICIOUS

PDF

67.1 KB Created: 2020-12-21 15:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93e018db583d1960362d6ed9f3f7911c SHA-1: 75867b5dae843e82313e02368baad792b038e4ab SHA-256: 9013ac4db525ecdcf36ea459424f931f40cfd5e3420a8b8153abaec288158518
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=carrie+underwood+songs+youtube+see+you+again
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/dowogife.pdf
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/lalukupe.pdf
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5fb66580ab8a6.pdf
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/1692564.pdf
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/gewise.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/58954.pdf
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/1bd27d272ce06f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazagidonux/cignal_play_app.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb473ca23154c95b6078/1606220620902/body_glove_water_filter_bg-1000.pdf
    • https://s3.amazonaws.com/gonima/angry_dispute_crossword_puzzle_answers.pdf
    • https://s3.amazonaws.com/napoledunadigo/vizio_37_inch_lcd_tv.pdf
    • https://s3.amazonaws.com/tunenijexe/57302772055.pdf
    • https://s3.amazonaws.com/vikukinumet/philosophy_of_special_education_articles.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5765a97599144eee7214/1606375269988/puvijomufib.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_off0000c9ad.bin
86de6d710762f4d28a2a6727fcf72788e84c40a9715fc21d8f94d8ba38e424bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 5200 bytes
font_01_sfnt_off0000db7e.bin
bc73bfe61e07abc648e2a78a963bf04ebb1a322bfedc8fc63a5afee4a56aa866
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 10496 bytes