Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6e44a03b1e3923…

MALICIOUS

PDF

73.5 KB Created: 2021-04-08 04:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f9be6251d2361ab8a3f7f70ce9df711c SHA-1: 932646eb8d74f384faeffcaab2c09aec636dbdfc SHA-256: dc6e44a03b1e3923545f464c06a7a49cf331c19cf89900b517de46f9b06c62ce
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://seumenha.ru/wix?keyword=eureka+math+7th+grade+module+1+lesson+18+answer+key', are likely used to redirect users to malicious sites.

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://seumenha.ru/wix?keyword=eureka+math+7th+grade+module+1+lesson+18+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413835/normal_606b2f206b587.pdfIn PDF document text
    • http://fortuneo.best/torrent_big_little_lieshrroo.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/pibezovix-runojadoro-faditojiv-josepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390071/normal_5ff8ed633856d.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/mapovamibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5ff46163b932e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_604b30bae4b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_601b00ecf0711.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/d9c345c953.pdfIn PDF document text
    • http://milanomodaitaly.site/dyson_v11_motorhead_cordless_vacuum_reviewsnniyt.pdfIn PDF document text
    • http://coolvdomaion.online/what_is_the_strongest_acid_listed_in_figure_2-2egmg1.pdfIn PDF document text
    • http://bigops.fun/xolunigidenenodovikneet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_60134b38c54c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_602e28d92cb0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5ffed391b6943.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/ropolexakazoror.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/f1c5c1bea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_604ce1998096c.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/3783558.pdfIn PDF document text
    • https://zogetira.weebly.com/uploads/1/3/4/5/134502553/b809dbbcbd7a85d.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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 5780 bytes
SHA-256: a9867fb4754c8ca1ac5ae73ee58eb6e0493aa8d147603b7acac97fc611e25678
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10204 bytes
SHA-256: ee0e7691bc29d3580f6b49dd20787b62a31f8683bf244bb619ac571c014b3c7c

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