Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef6a371b6f3ef71…

MALICIOUS

PDF

80.8 KB Created: 2021-04-28 20:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab7e3453aacbc0015bbcdec9f66e4572 SHA-1: 55aaafae36dc85ea08abe655f12133c2df7ca1e4 SHA-256: 2ef6a371b6f3ef71ec369e06416b512238ac2d6df762f7d48850466a394566d5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=best+mechanical+keyboard+for+mac PDF link annotation
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/97417e.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/2505610.pdfIn PDF document text
    • https://miwozowupib.weebly.com/uploads/1/3/2/6/132681947/55df06d18d671c.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/e090803fa70b.pdfIn PDF document text
    • https://givesuporej.weebly.com/uploads/1/3/5/3/135346238/3901856.pdfIn PDF document text
    • http://tuwuradozanava.iblogger.org/nemesis_board_game_rules.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/tamugojatatirom_xibefim_wegudupedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubesakitulifo.epizy.com/sony_str-dn1050_arc_setup.pdfIn PDF document text
    • http://nupadamemal.epizy.com/nejawalaweruxejupovukujas.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/surfboard_sbg6782-ac_user_guide.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/best_acknowledgement_for_dissertation.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/social_club_launcher_gta_5.pdfIn PDF document text
    • http://nerusejide.rf.gd/choosing_appropriate_quantitative_research_design_ppt.pdfIn PDF document text
    • http://golinab.rf.gd/avery_label_templates_5163.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_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 5616 bytes
SHA-256: 4533cec7cf4c1383539420afadb0d8f99e0a4f4d1629beb6a7e078c2ebcabef7
font_01_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 10948 bytes
SHA-256: 9ccaeaf865226c236e6fbf9071fb6f0730e8ea48975a2864834506d01de5ab32