Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78b75d4e3d339e5…

MALICIOUS

PDF

71.9 KB Created: 2020-12-18 18:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e2c564453ce5be2c9fa9b94b6a0feadb SHA-1: 7379bccf35632f3a492c152ecf9c05dd51f36359 SHA-256: b78b75d4e3d339e538131316bccf8d9f164a9b8b25609f29d97ebbf0d484ed58
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary suspicious URL identified as trafffe.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URI heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=e+minor+scale+guitar+pdf PDF link annotation
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/8364583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/20efff89-d4a4-44a5-b960-545825d59ca9/fisher_price_diaper_bag_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d952382-7dee-44a8-8fa3-23521e461d0a/eastside_baptist_church_east_cobb_marietta_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4da07e-b65f-4938-b701-cfbc7059bd14/fred_run_unblocked.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc676cd1452f90b7f0b4806/t/5fcb5a119cf56e0e8b1010eb/1607162386302/weapon_master_feat_5e_errata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07992bfc-f125-42e8-8441-35342552de0c/no_mans_sky_terrain_manipulator_con.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd2c30b6b03258f2f7c3b/t/5fc1c5f0f8cdb769c625460d/1606534644344/bowflex_xtl_workout_chart_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d06892f-feae-4f83-84e1-203ef99f8765/alesis_dm7x_drum_module.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6269fe27-a514-4edf-abfa-0cc13fac58b3/little_apple_dolls_animula.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc520d02cf09257bd86fd68/t/5fd1fbb8071bbc68802f2fff/1607596984574/american_football_national_league_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a34de7d9-b81f-4bc7-81f5-91ef90f5c969/rolex_explorer_ii_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dba087e-e600-4c20-8426-277044647eea/paboduvab.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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 5432 bytes
SHA-256: 8390a48a376500d4388f920f6af24426847a11de1d06eed5ba449a3261571507
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 11312 bytes
SHA-256: 7d6eed01a7106d02473bb892e937ac27c3fce199883bc3bd815f83aaa722fe22

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