Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cfe4b94d9c2bc6…

MALICIOUS

PDF

76.4 KB Created: 2021-05-08 17:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7015587937df91e75694b680d4f8a6f SHA-1: 22e11e5ada8d1436c34f3fce69d3bd24f1843509 SHA-256: 50cfe4b94d9c2bc6d3745444c72e4c0bb497ce4c99d81e0128ce783a87d8acca
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to other PDF files, indicating a link farm strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs, such as https://jacksth.ru/strik?utm_term=how+many+calories+in+a+taco+bell+soft+beef+taco, are likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+many+calories+in+a+taco+bell+soft+beef+taco
    • https://cdn.sqhk.co/vopuvafamiw/UUgcgjj/skins_minecraft_pe_adidas_girl.pdf
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6044fa6bb9e29.pdf
    • https://cdn.sqhk.co/mafowixodi/eElEh2x/alan_walker_greatest_hits_full_album_download.pdf
    • https://cdn.sqhk.co/zirigajer/gcRihbW/53809690921.pdf
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5ffc2705cf97f.pdf
    • https://cdn.sqhk.co/nifodotiriru/gfojAFT/resident_evil_game_download_for_java.pdf
    • https://sajesugepila.weebly.com/uploads/1/3/4/4/134467456/winebalujesanobisuwe.pdf
    • https://static.s123-cdn-static.com/uploads/4420905/normal_5fcc39ab22049.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/2be9d50.pdf
    • https://tofeligekejogen.weebly.com/uploads/1/3/4/8/134873344/1539874.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_d20ef238ee454d3ca91c27597e39c850.pdf?index=true
    • https://s3.amazonaws.com/mexijegedakol/pastor_chris_oyakhilome_books_free.pdf
    • https://s3.amazonaws.com/rebomedug/myspanishlab_answers_chapter_11.pdf
    • https://s3.amazonaws.com/zedudo/autoimmune_blistering_disease.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_69bdfdd824ce4c7288e660cd4f32bcdb.pdf?index=true
    • https://s3.amazonaws.com/baxekojojexusol/land_water_forms_worksheet.pdf
    • https://s3.amazonaws.com/falejogajir/how_to_install_a_motion_detection_light.pdf
    • https://s3.amazonaws.com/pubopelej/doodle_god_20th_century_guide.pdf
    • https://s3.amazonaws.com/lekezaru/97016754389.pdf
    • 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_off0000ed7b.bin
b3eacabc277309687299a481dddc4f7849c78cc506e9c6b876b9ecc77123883f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 5324 bytes
font_01_sfnt_off0000ff8e.bin
70e617f41d304afcad184bde214b33bd2cd80b8fdb09073aca822a5bc7151f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 10620 bytes

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