Malicious PDF — malware analysis report

Static analysis result for SHA-256 92091bda8820ba4b…

MALICIOUS

PDF

77.7 KB Created: 2021-04-21 22:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e7ca4b438af00c1ee258a43928b5d9be SHA-1: 5ab04b13d3471afd67c245d1e11403e3f7d3dd85 SHA-256: 92091bda8820ba4b83b534e99543a90a411eafaac0836a2d4e8f43a42969f525
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, with one prominent URL being `https://druttle.ru/strik?utm_term=dell+v313+printer+setup`, suggesting a phishing or redirection attempt. The presence of a link farm on disposable hosting further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=dell+v313+printer+setup PDF link annotation
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/lugexebuz_pepipakuzovom_pozokenarumedi_xujulep.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/4206934.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/nice_guidelines_iliac_artery_aneurysm.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/muzubasiwu/kghiayb/vilitefarutarajagugobetuw.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/9ea66d.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/oLCjaOZ/wogabu.pdfIn PDF document text
    • http://shop-you.xyz/lowrance_hook_3x_installation_guide9kts6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tomoxiguzuzi.epizy.com/buffalo_wild_wings_drink_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/33001170743.pdfIn PDF document text
    • http://puredaw.rf.gd/orissa_high_court_nic_cause_list.pdfIn PDF document text
    • http://fodukenama.epizy.com/xubokipuwa.pdfIn PDF document text
    • http://jazojogebi.rf.gd/realidades_3_capitulo_1_vocab.pdfIn PDF document text
    • http://duwamiwimi.rf.gd/27182354572.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/chocobo_racing_pc_game.pdfIn PDF document text
    • http://xawoforusur.epizy.com/alvida_song_metro.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/anthem_lights_band_mp4.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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 4876 bytes
SHA-256: b214927d11e698cd55c7d981da0afa4fdc5b9ba9ca05d8257e4e4ac8be9eec34
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 11684 bytes
SHA-256: 691dc0f336277ad75ecf052f109b2c307b8c2584c9d61943f1d9ebe0ad610e85