Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf06d57574e4700…

MALICIOUS

PDF

77.1 KB Created: 2021-02-25 15:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 25a79c6c3eba1b378eea2fb772ef5e00 SHA-1: 43848aeed01df94d10fb3690d467906501c292e3 SHA-256: caf06d57574e4700f2b19800a1e486c46996b507dbf8717b72fff76361442bd3
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=tekonsha+90250+prodigy+rf+electronic+brake+control+installation PDF link annotation
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/sopitekululovekawus.pdfIn PDF document text
    • http://neuroncraft.online/intermediate_accounting_solutions_manual_chapter_4gyx7v.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/selomexode.pdfIn PDF document text
    • http://sexedate69.site/wynk_music_apk_promo_codeqhsl7.pdfIn PDF document text
    • http://tradebot.space/72910666437mgtwt.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/pevowibiropasidi.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/iZgj0gc/pokemon_pikachu_wallpaper_download.pdfIn PDF document text
    • https://batibama.weebly.com/uploads/1/3/4/3/134338422/5bcce13d20c5.pdfIn PDF document text
    • https://jolezage.weebly.com/uploads/1/3/4/3/134336692/tisixitafataforur.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/supikobanurelo.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/eNCichi/58074086083.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/dhiieha/kung_fu_panda_game_level_zero.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/kofabube/datasheet_dari_arduino_uno.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/breakfast_at_tiffany_s_nytimes.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/anpanman_bts_song_ilkpop.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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 6224 bytes
SHA-256: 65f8e5bc380b888a790de86fc65bf7a9b8e7579dffd6ff8e3c27bc283088bedd
font_01_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 10780 bytes
SHA-256: c2ef2c4301d1dae8652579a4d18a61a4584ee04f208413441aed03b9ced46878

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