Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d01dbfa8d6e91d…

MALICIOUS

PDF

69.4 KB Created: 2021-02-11 22:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8e0e40a88a2f437cab0ee4ed43ea68a4 SHA-1: 7db9c652dfe4481b0d37b0c420dad90034e8bc92 SHA-256: c3d01dbfa8d6e91dc268edbdcd6fc3373f122d27e6342f6e414eacf383dead2b
186 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 hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://druttle.ru/wb?keyword=torch%20browser%20%20for%20windows', indicates a lure related to software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=torch%20browser%20%20for%20windows PDF link annotation
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/7650351.pdfIn PDF document text
    • https://fetenove.weebly.com/uploads/1/3/5/3/135330361/de6a8.pdfIn PDF document text
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/8089650.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/ighj6Id/37797111246.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/ij6ibiN/jiwokase.pdfIn PDF document text
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/6847d5be790.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/4gigihh/89529161394.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/47714cef1.pdfIn PDF document text
    • https://wujezevo.weebly.com/uploads/1/3/0/8/130874127/8513112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fde026a59662.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/mezakuresi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_60218767ca92f.pdfIn PDF document text
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/ruwerefuded.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/4530548.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/sazomo/soruf.pdfIn PDF document text
    • http://wepaxilex.epizy.com/meluzaxow.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/41745858333.pdfIn PDF document text
    • http://vesebebiwimana.epizy.com/mudap.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_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 5048 bytes
SHA-256: 86a9b8e75ee29160cc06c8aa7e33d13aba0b7e16e737ba25a3ebb49410594c55
font_01_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 11516 bytes
SHA-256: 011476490ca0084ade0faf36bc6c11902556900c08022711dd63f165ea1933ae

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