Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c224bda66570cf…

MALICIOUS

PDF

76.1 KB Created: 2021-04-05 13:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b0c2bcc5d7cbbe097f72da59ca0c8aa1 SHA-1: 048815890fce90e4e3fc5389bcec6f93ab71f20e SHA-256: 94c224bda66570cf8582946d2c12173e389005646355d8b89d8a10c04369ac9f
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to contain search query-like text, likely a lure to encourage clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://vilenefex.ru/strik?utm_term=how+many+quarts+of+oil+does+a+2002+ford+explorer+4.0+take PDF link annotation
    • https://cdn.sqhk.co/xasexuwosul/hcOtlYe/poached_eggs_in_steam_oven.pdfIn PDF document text
    • http://nesakud.mypressonline.com/xexivamuzosuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/ijSCxmj/pokemon_tcg_online_apk_2._68._0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448713/normal_5fffa6f8e12b9.pdfIn PDF document text
    • http://zedateve.mypressonline.com/how_to_pay_my_credit_one_bill.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/aTrLih1/27852497624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6029d939f258f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_602999a60b0db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5ff85295be563.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/8kFhaW3/tojuvefowabujatuxuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fd8470bdadea.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/A9EjaVT/ifttt_button_apple_watch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/game_astro_boy_omega_factor.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/hill_rom_versacare_bed_manual.pdfIn PDF document text
    • http://voturugivorajop.onlinewebshop.net/22389676764.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_5ae6c4a053e8473c8a5b165f5fc9d980.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/tratamiento_de_insuficiencia_cardiaca_congestiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b999607-c7a5-488e-a1fb-faab29783b1a/fujevifosavurivoxadijij.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_cfccad3946aa46eea315022d3e57fa30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/roduxale.pdfIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_d5816494f0314106855a3cf7a0ad5344.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/tomtom_go_6000_update_fehlgeschlagen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a55dbc6-65d8-4160-b8ed-d7acbe6abeb1/full_quran_translation_in_english_download.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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 5992 bytes
SHA-256: 7d9b180d61a3e235399b89fdc365ffa8bc16c6d70c1a0cead6e2f5ff5116a7b3
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 11264 bytes
SHA-256: d519bd3b31b4b9f4ab3768de28b10ec1517b18a84dc016df72ab2568361b167a