Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b3d1ad9fe15d3d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-06 05:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d39d8d3580f058159d5f3b0b7fda9459 SHA-1: 779a8998b8239fee9ee988a8ce85d685f74f862d SHA-256: f8b3d1ad9fe15d3dd9c99adbed16cfa9f2521b7bb057447d7e21600e141334b7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no explicit script was found, the PDF structure and embedded URLs suggest it's designed to drive traffic to potentially harmful websites, possibly as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://gimoguvi.ru/wix?keyword=go+klear+teeth+whitening+pen+reviews PDF link annotation
    • http://vsedlyatebya.xyz/nakipapidolixefafigulugirbqd7.pdfIn PDF document text
    • https://fufigejopugip.weebly.com/uploads/1/3/1/0/131070204/lazuwasow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_601cb075ddce0.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/hbmhfjb/iphone_ringtone_2020_download_pagalworld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_60305311b9c9b.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/sejd4XM/xonogororuleteki.pdfIn PDF document text
    • https://cdn.sqhk.co/dujepiwewi/jizjcWM/piggy_stick_fighterz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5fdba195efea9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fcf58a02971b.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/hVCEMo3/wegozabej.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/iVqgf9a/zombie_apocalypse_game_unblocked_weebly.pdfIn PDF document text
    • http://begdas.fun/555135381667wkz4.pdfIn PDF document text
    • http://gufutaca1.xyz/how_to_setup_tp_link_tl-wa850res15hh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_60032ba7653a3.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/ruvivajaxogi.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/vafej.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/diwitapezu/avengers_movie_collection_free_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/formal_dress_code_for_wedding_dinner.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/10463084594.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/bmat_section_3_2018_answers.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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5328 bytes
SHA-256: 0c05fcdddc7905459af6675f9771f9b1182aa716060686295cedfc7240c02f3a
font_01_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 10540 bytes
SHA-256: 87cf4f352fd26bb08421fb6096a011b9b5c516c7c52cca9b77442ab453122953

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