Malicious PDF — malware analysis report

Static analysis result for SHA-256 304867ce459d4e71…

MALICIOUS

PDF

86.9 KB Created: 2021-03-22 07:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 136e1f414f91b388532e9e4671197c6f SHA-1: 2333f7be93f6d4c5b373d0cee2ed63cb307b428a SHA-256: 304867ce459d4e71b8ee3f4cd45e791716b90255e3f04877e76df2a04d9d36c6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to movie recommendations, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=perdona+si+te+llamo+amor+peliculas+similares In PDF document text
    • https://cdn.sqhk.co/galemojubemo/jdO5zge/64870678896.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/cobalamina_alta.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/21733283128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479446/normal_600004164dad7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_600699b146020.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/misejofadewapu.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/pesexazululogipene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370063/normal_5fdfb3881ffba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_602a4c3b49ce5.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/lunejivigalofufuguda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_60411f62156aa.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jhz9uBj/97465633709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_60032b7c93f79.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/3636213.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/fiajfP3/can_you_cut_bermuda_grass_when_wet.pdfIn PDF document text
    • https://jolamaripewefof.weebly.com/uploads/1/3/4/6/134655052/tubisanuno.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/jhS4Jjf/amazon_goes_gold_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/hiMhb8G/bengali_movie_bandhan_mp4_video_song.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/49a44700-edb1-4f10-8f64-ddbdda3aff1d/musical_note_crossword_clue_5_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663b400f-f46b-4359-a0e2-5da0978500c7/how_much_should_a_full_car_detail_cost.pdfIn PDF document text
    • http://medexode.atwebpages.com/brand_identity_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389de6cb-f92d-443c-83e5-a3ceb777c11a/how_to_get_my_hp_printer_to_scan_to_my_mac.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 5220 bytes
SHA-256: 55570236f996f6e78643e088c8d5ac6cb47a46508c68f17bfc317b38ac63d64b
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 12112 bytes
SHA-256: a9f08452e80b3d6abcf72fbe2c16021cb285cc7276ddad989a63d18bac090898
font_03_sfnt_off000135cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CB 16340 bytes
SHA-256: 8680b359cba86e2f6e9a78cf8c0f9e51b009e062d62f51157c34cd29f25a410b