Malicious PDF — malware analysis report

Static analysis result for SHA-256 36af8ffcebab107f…

MALICIOUS

PDF

76.6 KB Created: 2021-04-07 20:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 49e46f6e60aa25a51bd255424e0b625e SHA-1: a9290c109883169b2ff5be332e7de28f00308f9c SHA-256: 36af8ffcebab107f6f0ef25356bbf9186314bd96aaf8e0b5b2b869bfdd1dbce2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The embedded URLs and the heuristic firings strongly suggest a phishing or SEO-based malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=thermador+oven+trouble+codes PDF link annotation
    • https://zulusoneruw.weebly.com/uploads/1/3/4/8/134887175/peduxuxere-zenutopenerazu-tidisovuzelita.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/one_minute_manager_summary_ppt.pdfIn PDF document text
    • https://bonomomu.weebly.com/uploads/1/3/0/7/130775928/firupopaz.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/2039724.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/63854787304.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/KFwUOhj/52345717807.pdfIn PDF document text
    • https://tuxakosubulep.weebly.com/uploads/1/3/4/0/134012578/eaf8019.pdfIn PDF document text
    • https://sojozukajarab.weebly.com/uploads/1/3/4/2/134265810/87ab884da66d.pdfIn PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/9050630.pdfIn PDF document text
    • https://bomobokoluv.weebly.com/uploads/1/3/1/4/131437025/6222263.pdfIn PDF document text
    • https://cdn.sqhk.co/roxirali/4UM4cgf/sony_action_cam_as50_manual.pdfIn PDF document text
    • https://jinitemolo.weebly.com/uploads/1/3/1/8/131856214/zosalazoxukusasa.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/heGjAMF/javavan.pdfIn PDF document text
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/piledorabe_wurunaf_gakunozapugu.pdfIn PDF document text
    • https://bizekexejanagiv.weebly.com/uploads/1/3/4/5/134593847/8164819.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/5bf2c73ca.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/5703218.pdfIn PDF document text
    • https://loremodowudoro.weebly.com/uploads/1/3/2/7/132712063/c782fd.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/retalakesozud-nupevu.pdfIn PDF document text
    • https://cdn.sqhk.co/kabutijefix/nwrid9z/switzerland_capital_city_video.pdfIn PDF document text
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/lufanojikadajemalej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzuwukef.atwebpages.com/cairbar_schutel.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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5328 bytes
SHA-256: 6c60377e1e83d55c46b74fbaa83612e70440c2dc9e0e5d331535754b48adc4ba
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 10444 bytes
SHA-256: 0e11219eeef57eb12f105800002670710a12ca225e83c52e24105673c1636288