Malicious PDF — malware analysis report

Static analysis result for SHA-256 af083bd37b420d7e…

MALICIOUS

PDF

85.8 KB Created: 2021-03-23 17:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e468146272af7b36032d3604da3d0735 SHA-1: a3ef5977577fc3afb1da7406a161b34aaae60aff SHA-256: af083bd37b420d7eee3c6e42639ddd0855883b9482a6d6d680bef30dbb2fb636
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://bologen.ru/award?keyword=alejandro+dumas+los+tres+mosqueteros+pdf PDF link annotation
    • https://cdn.sqhk.co/tesosunimew/jdusidx/41293767984.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/xibowef_xeremave.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/kolesame-fewepasesido-tumitigubemibo.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/cicQZjf/40644851116.pdfIn PDF document text
    • http://mowuvivof.22web.org/22859364083.pdfIn PDF document text
    • https://noduxureravit.weebly.com/uploads/1/3/4/7/134743755/rowemixavosan.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/tgdn6hf/79941471409.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/hahdEid/93907527270.pdfIn PDF document text
    • http://joteruzawareba.iblogger.org/17572040756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tavawefojob.epizy.com/33283247494.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/braun_thermoscan_7_irt_6520_best_price.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/air_force_ranks.pdfIn PDF document text
    • http://fofilelajisemap.rf.gd/honda_rebel_1000_release_date.pdfIn PDF document text
    • http://mojozore.myartsonline.com/lavebiwitun.pdfIn PDF document text
    • http://zunufofidufup.rf.gd/kailanan_ng_pang-_uri_worksheets.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/catia_v5_sheet_metal_tutorial_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/14608180795.pdfIn PDF document text
    • http://xefukogan.rf.gd/jukegorowirofegipeze.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/detailed_information_synonym.pdfIn PDF document text
    • http://kopuperoki.epizy.com/36316100070.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/blood_blister_under_tongue_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 5212 bytes
SHA-256: e2deddcc8cc9f370a02df69bb1ec0cfc4233edbf839a7eaf0c32fdc8781b2537
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 11632 bytes
SHA-256: da4df2d486b13a029aee054ae15b5a3e672f53eed4a3d96c6874b8b56b9c5f69
font_02_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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