Malicious PDF — malware analysis report

Static analysis result for SHA-256 c448b2eb6a6b26f2…

MALICIOUS

PDF

68.0 KB Created: 2021-04-01 10:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5ea8192458d48948f710bcf564f4eeea SHA-1: b3f86e426b1ce6707c3695833872ef274ab42bb4 SHA-256: c448b2eb6a6b26f2fe426e55fdc4b06943be8c4fcd8f669c2845010f6975f7ac
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 presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's primary purpose is to drive traffic to these external sites, likely for phishing or malware distribution.

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://bologen.ru/award?keyword=benim+hocam+tarih+video+ders+notlar%25C4%25B1+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/duputokodoz/txZhhjc/31345399891.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/gonesosexufobo.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/igjErhc/baixar_cd_elvis_presley_greatest_hits.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/kozud.pdfIn PDF document text
    • https://wufodosutitivo.weebly.com/uploads/1/3/0/7/130739718/biropixafu_jejopawalo_sajuvemaxazak.pdfIn PDF document text
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/kepovu_fogitemom_vozegusagusefe.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/izXjaib/11558812537.pdfIn PDF document text
    • https://cdn.sqhk.co/gamakokub/aiiRvOc/ableton_10_shortcuts.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/573fd05474.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/f1TiaS0/juwesazeledolulojasugeka.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/7211204.pdfIn PDF document text
    • https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/9d38e28d406.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/id6hj6P/wefewuzevo.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/dgihgdB/assistant_manager_jobs_nyc.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/bubawajulif-puliradomemawu-zimodupimil.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/hjigI4q/11567607556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_3c8050bccd044aa1bbcf1ecc3c28b0ae.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_6e8d7c6d27d141689fd2a85a3b52015a.pdf?index=trueIn PDF document text
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_94d83e8418c74d4b979aa039ae19dfcb.pdf?index=trueIn 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_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 5812 bytes
SHA-256: 686abe48dc7f76fd76815dc17fe2c0ad5b1a68d5dba890179a51578d40c4c638
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 10516 bytes
SHA-256: 5a687ca1b610bc6451700367dbbefb81c591399755cead5745dee8f37523ff39

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