Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af028732f8f707b…

MALICIOUS

PDF

72.4 KB Created: 2021-04-02 08:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4617b8804c1bc5c71a991c764eadb144 SHA-1: f3b9d21817d84d997865be203b06d06de615d73c SHA-256: 2af028732f8f707b366075316fd6a22486b8849d59d1f9e2ef44bbfa7c1edb55
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 SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=cross+sectional+human+anatomy+david+dean+pdf PDF link annotation
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/tuditusizagewotixe.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/1520306.pdfIn PDF document text
    • https://mitometivu.weebly.com/uploads/1/3/6/0/136094147/lopafamiwajop_xozadijejizi_jojibusofof_lovonan.pdfIn PDF document text
    • https://nibukebomuxa.weebly.com/uploads/1/3/1/4/131455734/tadasefubidemal-bomekotakupeva.pdfIn PDF document text
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/lowupuvosuzoz.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/3390d.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/2c617e5bc6adf8.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/mta_subway_map_2020.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/268bad05f15ec5b.pdfIn PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/7650127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_604157ece6729.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/2323197.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/anoxia_del_recien_nacido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_603cb40322e92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigidafavubo.myartsonline.com/sasekazo.pdfIn PDF document text
    • https://doi.org/10.1148/radioloIn 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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 5460 bytes
SHA-256: 0bc14f8fd6167bcbe5984b263a7cef7be35e3b98d3592d51f39d1f7d7fcccd5d
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 11556 bytes
SHA-256: 66ae461b1979149b7f5b6a0a2eda862d5a4fc6787b6eba56fa8407db4877058f

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