Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf391cc11330e12a…

MALICIOUS

PDF

83.6 KB Created: 2021-03-20 19:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 556a2724fbc90a53f8a3e2ba7a3ef2a7 SHA-1: 7c6af019c6be41b565ff35a19192f687b51e5eaf SHA-256: cf391cc11330e12a77d5135cf9ad69b6b570155be51ab64604dda60cc17fc51f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://kuzutuzo.ru/strik?utm_term=how+to+do+the+10+step+dance+cowboy+boogie', and another critical heuristic identified a link farm starting with 'http://tehnotop.site/regofasidosexom35f75.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+do+the+10+step+dance+cowboy+boogie
    • http://tehnotop.site/regofasidosexom35f75.pdf
    • https://cdn.sqhk.co/puxezuxivas/cggNhfB/app_vault_miui_12_apk.pdf
    • https://cdn.sqhk.co/vujalenan/ghjf7gi/serolapudumidavafutex.pdf
    • http://nazhivy.net/42606132999jtypc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_d9bb6535d020415ba01077e235cfeec7.pdf?index=true
    • http://wejifofodig.rf.gd/rileworijatibuxigu.pdf
    • https://s3.amazonaws.com/bejenosugede/25114746801.pdf
    • http://vominobig.rf.gd/2587977220.pdf
    • https://s3.amazonaws.com/sedimeraxufi/bang_bang_full_video_song_mp4.pdf
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_3c9ba26bc55d4642a193776451410de9.pdf?index=true
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_04fbd1a114784ca48073c8bd7e97a069.pdf?index=true
    • https://s3.amazonaws.com/zesixefe/eaton_fuller_parts_list.pdf
    • https://s3.amazonaws.com/paxunu/transmission_request_form_aditya_birla_mutual_fund.pdf
    • https://s3.amazonaws.com/tugabijenovili/jitagasekademojizutadutoz.pdf
    • http://gafazexetoraxik.epizy.com/cdrh_laser_annual_report.pdf
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_0e2aa71edbe54c7fa971088734b763ad.pdf?index=true
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_06a908afba8e44ceb74674dae90e684e.pdf?index=true
    • http://nexoluximil.rf.gd/nikon_d40x_camera_price_in_india.pdf
    • http://radalimufan.rf.gd/anjaana_anjaani_song_wapking.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d9.bin
fe438bef02abfa0100477b7ea9960b69d6372528ec8c1073808cdfab86cc0654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 5696 bytes
font_01_sfnt_off00011b54.bin
34cf035ff81db0caac6a815489f9a3f8494ffc9865f350e361f423152e916976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 11168 bytes

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