Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1f0105472b7475…

MALICIOUS

PDF

66.9 KB Created: 2021-01-31 23:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 743cfefb2c73ba37337c8fd8b6565020 SHA-1: e52aaed51346033dacc16ca1e1080ad72911eeb9 SHA-256: 3a1f0105472b7475dc40b015c8aaa3c4e65b9c80dfc44e44a8cab4cba15b6e54
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=ceramic+electric+kettle+canada PDF link annotation
    • http://repair-foto.ru/diablo_2_plugy_1._14d_downloadm4lyf.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/tamotijugon_dikekuk.pdfIn PDF document text
    • http://winoraama.site/pipefitters_and_welders_handbooksm0th.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/pepikazojod.pdfIn PDF document text
    • http://kzrovk.xyz/pemasejax42aj.pdfIn PDF document text
    • http://digitalcalakk1.xyz/scrum_master_trainingd2mso.pdfIn PDF document text
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/xaginekukunof-pamugekuzu.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/digutekoxesabib.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/jejjtzn/99900073060.pdfIn PDF document text
    • http://taxavifosobedul.iblogger.org/wheel_of_fortune_cheat_sheet_person.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozoresupiz.epizy.com/texuwapapajo.pdfIn PDF document text
    • http://tujiritam.epizy.com/93298086000.pdfIn PDF document text
    • http://zugodelojuj.epizy.com/lease_agreement_form_sample.pdfIn PDF document text
    • http://wuriwafu.epizy.com/74569517517.pdfIn PDF document text
    • http://givonomiruf.rf.gd/brandon_grotesque_font.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/95541295871.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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 4876 bytes
SHA-256: e8ee5d275eb28194d42dbb7dd41dd5235869ae007fd8e9bf827b88ba2887dde5
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10196 bytes
SHA-256: 4df506fcdcb5a4e05375b4d01911c8e483b8d462050e5489140c7d5eb85c296e

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