Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed8b4071d1000fb…

MALICIOUS

PDF

75.3 KB Created: 2021-04-08 06:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b5633f8b495867beb191d96bf25d26a SHA-1: b0f84346ba54e59d2ee546a5382366843c0fd3ab SHA-256: 6ed8b4071d1000fba28952cef4aae0a8c86d2bdbaa1272c1ffd93cf3eabc83cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent URL, https://ponafet.ru/123?utm_term=apologia+de+socrates+pdf+descargar, is flagged as unknown and is likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=apologia+de+socrates+pdf+descargar
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6021402589007.pdf
    • https://cdn.sqhk.co/tojorovexuw/ocCKErG/63042702481.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_6054229ec0b7b.pdf
    • https://cdn-cms.f-static.net/uploads/4450870/normal_603eb27e62416.pdf
    • https://cdn.sqhk.co/lafuwexale/ghDjicH/zujirigejojenibusinume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/993288db-0c11-44a1-a616-28c4d1c6c0a2/duxanar.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_f4b46179e5c0416fa1e20ffa9fb742ce.pdf?index=true
    • https://s3.amazonaws.com/retisovojor/bully_scholarship_edition_trainer_pc.pdf
    • https://uploads.strikinglycdn.com/files/0d5887e5-40be-4522-aed4-a4b4d53feb31/guess_the_brand_answers_level_125.pdf
    • https://s3.amazonaws.com/falufusu/home_budget_spreadsheet_printable.pdf
    • https://uploads.strikinglycdn.com/files/90a135bf-44e9-4872-8f11-ca6ab6400ba6/light_novel_definition.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/aladdin_song_bengali.pdf
    • https://uploads.strikinglycdn.com/files/b8fdcd35-d172-4df6-ad8f-57e307cd58b3/future_verb_forms_exercises.pdf
    • https://s3.amazonaws.com/mixanaz/dugudij.pdf
    • https://86860ce8-2957-478e-97c3-2abddc2d2c3c.filesusr.com/ugd/754ed1_b05b28d8cc064d248cd93258ead9d295.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4196f7e7-f493-41cd-ae69-1e55f3b2e637/nexus_1000v_ovf_download.pdf
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_fdeda5af9343430d8281a64fa2eab6b4.pdf?index=true
    • https://s3.amazonaws.com/vedexajawo/android_emulator_not_connecting_to_localhost.pdf
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_54b03cdbb050447585354b50a119c2a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45a57bb3-bcc6-42cf-b2f7-b504c6981c26/elementary_statistics_triola_12th_edition.pdf
    • https://uploads.strikinglycdn.com/files/6bc1357c-0b16-455b-a6e1-91be85a5803f/61505010288.pdf
    • https://uploads.strikinglycdn.com/files/65cf5150-f577-48d9-9b74-c9884e8118e0/how_to_clean_flavorwave_turbo_oven.pdf
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_0df09693b5f04fec91de47c969dfecf5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65a.bin
01e3be9e44f48ec78d4bf2b90ca382b7a3e28812d81df44892efa294aff39542		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 5312 bytes
font_01_sfnt_off0000f87c.bin
54f1f5708c22c3adaccc8c2b77625ea1446e422c22745eaf1ec505aa91c50f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 11740 bytes

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