Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf5b11855379c84…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 00:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8b02d19f3bbd1875ea7456c057918ba0 SHA-1: 899689c78e9e5b8e028eab8ec437e07acefe2615 SHA-256: 7bf5b11855379c8426f68c3099b78528f36c372a195ad8032008db4b30cbe605
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains or subdomains, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/wix?keyword=wine+enthusiast+272+03 PDF link annotation
    • https://cdn.sqhk.co/kilalovuge/huEhgDu/wuzalewagalixi.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/eeEi7gj/story_saver_for_facebook_lite.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/jRggjbu/pefitufedebofagomozi.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/hiJDhig/fewowuzozen.pdfIn PDF document text
    • https://cdn.sqhk.co/xokunafuse/ngiXssk/algebra_calculator_with_exponents.pdfIn PDF document text
    • http://tgesheff.xyz/how_to_get_free_itunes_card_codes75vvq.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/kaliniditenopamuwu.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/xuxabi.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/14509096610.pdfIn PDF document text
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/f95b7af.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/jesubakisewuzedur.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/hifsgjg/free_prints_photo_tiles_promo_code_free_shipping.pdfIn PDF document text
    • http://the-glow.ru/tatisijoxibudarag91knq.pdfIn PDF document text
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/ef6501c8134efa.pdfIn PDF document text
    • http://latuha.com/what_symptoms_do_you_get_when_your_blood_pressure_is_highe7fw4.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/super_metroid_hacks_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/UBjeDhi/big_bang_theory_theme_song_full.pdfIn PDF document text
    • http://remontnatali.ru/98974765242nkd3p.pdfIn PDF document text
    • http://stavki-na-sport.site/temopalonafelage2sqz.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/Zjdhjjj/quick_views_free_views_boosters.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/44469966027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/tifabatututawanodavozij.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_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 5176 bytes
SHA-256: a1ed21f6c89a4156d202886c7ed2be642a04f711f67c072420825fe769281a3e
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 10360 bytes
SHA-256: 0869cb2a59decdcee3341736e4e6ab6f8d0c10a5b85dcb3ea7d3ea50c65bfed4