Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca72f167c95842a8…

MALICIOUS

PDF

72.4 KB Created: 2021-03-03 02:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bfb28c464278cca9f03a8ea8303e68aa SHA-1: 9ea41aef73a43cb6bf24880b014b8ff0ace1d155 SHA-256: ca72f167c95842a85c8623636fd8752c8049ea12f97d6884457d8b08714f6eb2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://xezojetit.ru/123?utm_term=how+to+start+writing+research+article PDF link annotation
    • http://kutifelafal.iblogger.org/how_to_operate_a_keurig_k_elite.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/iigfAie/driving_school_3d_mod_apk_revdl.pdfIn PDF document text
    • http://shlifovka-pol.website/221088258663k2h8.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/izUiiif/kadididuxam.pdfIn PDF document text
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/6561548.pdfIn PDF document text
    • http://axecheat6.xyz/what_do_you_call_your_godmothers_daughterns4kw.pdfIn PDF document text
    • http://canonsburglake.com/the_team_manager_in_spanishuceu4.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/ebpggQH/international_calls_to_egypt.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/figomugixu.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/nafakularariluxugef.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/hfhcdC4/tarojosakelimirotil.pdfIn PDF document text
    • http://torchland.xyz/bileikler_ve_formlleri_8._snf77aeo.pdfIn PDF document text
    • http://usesalon.xyz/ranovasodubivomuxalosa6ge1z.pdfIn PDF document text
    • https://cdn.sqhk.co/vudemijugamu/hjfFXhb/fasubiko.pdfIn PDF document text
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/zuxemagelab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://melurijaniloxa.rf.gd/81873582159.pdfIn PDF document text
    • http://nenidexixod.epizy.com/using_inductive_reasoning_to_make_conjectures_worksheet.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_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 5116 bytes
SHA-256: 1f8b3a7bb6bd50a94c2f459c6c40fe47f1ad30ca195c8e814b14af8ab44e519f
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 10300 bytes
SHA-256: a7a32ddf4a5c476e6f71653375b68ef02bdbfb3376f81ccc761f1bd4c9e647b6

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