Malicious PDF — malware analysis report

Static analysis result for SHA-256 b283561f2c883ef2…

MALICIOUS

PDF

78.5 KB Created: 2021-03-01 22:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b8cd782b22b96ed2691a2704c70f732c SHA-1: 6a59b0b4f8dbd256b872fbe51ac1665666578016 SHA-256: b283561f2c883ef24c689f4e242a1a8ed038742361f7a7caec671428e8c1179d
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 a link farm designed to redirect users to potentially harmful content. The embedded URLs and the document's structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=honda+1000+generator+for+sale+used PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375077/normal_6007b53178319.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/livuvupubujasenuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_5fd0d870b63a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_600c8ad8d4d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_5fe632d012831.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/xikorowezodazutor.pdfIn PDF document text
    • https://nutotawi.weebly.com/uploads/1/3/0/8/130813366/pupuna-denegozeva-vutitesovabera.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/hiejfih/19738594173.pdfIn PDF document text
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/neluxoguj.pdfIn PDF document text
    • https://bijejosuti.weebly.com/uploads/1/3/1/6/131637047/zenado-siwojoviw.pdfIn PDF document text
    • http://dress-russia.ru/67778468581h5mbo.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/cjc7zid/sanicon_turbo_600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366354/normal_5fee8fe3903fc.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/gaxus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 5228 bytes
SHA-256: 53e3585c177159bb86d1ba10e2e02eecc9a0ba0b2ae18be80048e22157af47ce
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 10436 bytes
SHA-256: a0b0deb17bc1b5cc154e3c83eae7386215f3c5081f9e9ce60777cf5d72454ccc

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