Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8b6f146980265b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 10:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a04e1906de31a6cfa268868b45ac03f SHA-1: 88e80d6d0d3b002b491039307efe92293fafe81d SHA-256: fb8b6f146980265bb8c2c121160a1fd8f781f914643d8a175ddb7ebd28258f8c
186 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 pointing to 'pelibifir.ru'. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests a phishing or malware delivery attempt.

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://pelibifir.ru/strik?utm_term=what+happens+to+bonds+when+stock+market+goes+down PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_4bb3579b039e45d99a69e1ebdc34f1de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef39bc8e-6152-4cca-a010-b1f00666dc8e/harry_potter_6_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/genie_pro_screw_drive_sensor_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2b7e39-997d-4e9f-abdc-64e2736f2485/zip_code_houston_texas_usa.pdfIn PDF document text
    • http://tobezizasatixib.epizy.com/99511657578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff5abc4-e5ed-479f-9c11-78f71228eae4/tutoriales_para_aprender_a_tocar_guitarra_acustica_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f784b76b-07ff-44d4-9c52-988b5a070537/pioneer_avh-x1500dvd_wiring_harness.pdfIn PDF document text
    • http://wokolutomi.rf.gd/lista_de_verbos_en_aleman.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/27271466483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6bf350-ff20-4b8e-9761-da5b3792193c/diaper_genie_how_to_put_together.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/povuranebarajoxuzerumese.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_dc8ca3e41c214aed83d46d3f25d15d95.pdf?index=trueIn PDF document text
    • http://vevenamefod.epizy.com/zunirilusokopirikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/nesofad.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_a723a34bbd7b4643b411a86a61825a58.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_82b224d4b9b54b7a82c6ddaa5bc71eb3.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_0ee6129c88d94cd7a91b5e28a6f75db8.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_972ed43468f04412aa1a88fa9bc73a3b.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_27fc940bbc5e49388dc6711abbb2a69d.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_27c60ec8ccba45fa87649645e1328186.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_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 5764 bytes
SHA-256: 3ff564e129df1cdfe9c79c83d3586fafbabe55a41973520c53d9053820169453
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 11136 bytes
SHA-256: 75c61f6a5971ac8551ae84b3cf346aeef267ab4fd7f7176ee9daedf79a300e3a