Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dbcb7f10fc5a4c…

MALICIOUS

PDF

75.4 KB Created: 2021-06-11 00:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ca30fae72eedf55cc243f6f35f451fb7 SHA-1: d60d12a0977aa43f21d78d745b1e42d5db18aa49 SHA-256: b0dbcb7f10fc5a4cb6b5e99893204ab1b92f755b006f8ebca076071236632f66
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/pbw?utm_term=xf+autocad+2013+64+bit PDF link annotation
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/4b37e.pdfIn PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/4f99a9da.pdfIn PDF document text
    • https://zesefonivileje.weebly.com/uploads/1/3/1/4/131437583/3fb75c243a.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/nuzuvamomexinu_fukeripo_xapevat.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/nupuwupugomoxuvelom.pdfIn PDF document text
    • https://rugoxeribagiwa.weebly.com/uploads/1/3/4/5/134529694/morezamajavulobaxir.pdfIn PDF document text
    • https://midumusifefo.weebly.com/uploads/1/3/5/4/135401272/tasuwawutoxoru_jajulixijebola_dulidetid.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/2bca3f25e9dcee.pdfIn PDF document text
    • https://nogusevufofe.weebly.com/uploads/1/3/4/5/134525370/7704b71d2d.pdfIn PDF document text
    • https://navaraze.weebly.com/uploads/1/3/4/6/134682655/556e1eb61e7.pdfIn PDF document text
    • https://nebilewanowuz.weebly.com/uploads/1/3/6/0/136083660/5128280.pdfIn PDF document text
    • https://kimodoximotoden.weebly.com/uploads/1/3/1/8/131856266/bb1f3944.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/a0888d5e5e1.pdfIn PDF document text
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/7794140.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144555828/what_is_the_main_idea_of_and_of_clay_are_we_created.pdfIn PDF document text
    • http://dodosuta.pbworks.com/f/genki_2nd_edition_workbook_answers.pdfIn PDF document text
    • http://tesesazef.pbworks.com/w/file/fetch/145056486/10446263504.pdfIn PDF document text
    • http://lebamojopa.pbworks.com/f/how_to_turn_on_a_farberware_air_fryer.pdfIn PDF document text
    • http://jabevexizoj.pbworks.com/w/file/fetch/144783828/kaala_tamil_movie_tamilrockers.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411867/tagowovomitetizi.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_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5556 bytes
SHA-256: 8dcd9afbf1ade14fc090c9b8a71eaf48751c07d30671f5f951a09ef78c1e0101
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 11660 bytes
SHA-256: 7dcf913a72d79d4e3b761a20aea55db06464d52016fb0fc30a6fe05e29eb04aa