Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bca5e0615d4013…

MALICIOUS

PDF

73.2 KB Created: 2021-04-13 13:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 89d156b5b64cd34f5d53c8e0a913a477 SHA-1: d2e3be405c69e6f0f98efa1213fe6aa1137de8f2 SHA-256: 55bca5e0615d40135189b6dd361e02cb4880633d0ac5645139e02b6ecd9e9339
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection scheme to distribute malicious content. The PDF structure and embedded URIs indicate an attempt to trick users into visiting potentially harmful websites.

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=niv+bible+concordance+pdf+download PDF link annotation
    • http://remont-kvartir-otzyvy.moscow/60211125548xvszq.pdfIn PDF document text
    • http://sesugato.iblogger.org/44663629508.pdfIn PDF document text
    • http://mif-smeh.space/vurirovevopepulovijaeo8h1.pdfIn PDF document text
    • http://rugozuravonabib.22web.org/43200804293.pdfIn PDF document text
    • http://takovevagagiv.scienceontheweb.net/bahaya_asap_rokok_bagi_ibu_hamil_dan_janin.pdfIn PDF document text
    • http://kuvelopomegemes.iblogger.org/transtorno_da_ansiedade_generalizada.pdfIn PDF document text
    • http://jumbochecker.com/dipotakekejusurkc4g.pdfIn PDF document text
    • http://educationonline.website/surface_area_of_prisms_practice_worksheetupavo.pdfIn PDF document text
    • http://evatopshop.xyz/romeo_and_juliet_act_1_scene_5_activities4hsmy.pdfIn PDF document text
    • http://jirajoligo.22web.org/35843871199.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/33686866053.pdfIn PDF document text
    • http://caterm.ru/do_next_restock_sold_out_itemsjjovq.pdfIn PDF document text
    • http://quinzsy-studio.design/lumanixemimikibivasipatulo4xvq.pdfIn PDF document text
    • http://chambre.xyz/urology_dx_codeshp9cf.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://nowapuporab.epizy.com/videosecu_ml531be_tv_wall_mount_installation_instructions.pdfIn PDF document text
    • http://kajufikuxididon.rf.gd/the_firebombing_of_tokyo_answers._com.pdfIn PDF document text
    • http://biranon.rf.gd/97391914688.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.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_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 4940 bytes
SHA-256: 5a3b14797236d370a113ef1143dcbab01a2b9a522cc55d318ec2799aa29b056b
font_01_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 10636 bytes
SHA-256: c3f9effdc28b77102b96b7ff15ff9e8716a6a40f2bea97b4936aa0d6cffae674
font_02_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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