Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c6e3b03ab6885d…

MALICIOUS

PDF

84.4 KB Created: 2021-01-01 14:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 997ebef0222241acfa680c4f71408c2f SHA-1: 276f7867f9596961a58c691691ec5cec2a919e51 SHA-256: 83c6e3b03ab6885d4e7ce6e99ed7edcbd03ca4a6cb0503d4435b87a0d15f3cd5
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary suspicious URL being traffset.ru. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffset.ru/aws?utm_term=chronic+bachelor+songs++kuttyweb PDF link annotation
    • https://lupupoxapupep.weebly.com/uploads/1/3/4/4/134493602/sopoxaxe.pdfIn PDF document text
    • https://lupupoxapuIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/lg_waveforce_washer_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/premam_telugu_movie_video_songs_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/carplay_usb_dongle_android_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdcf821-464d-4347-95d5-839fc88bfd25/vikexakaxanaluwajogesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec8763a-4ebd-4596-b860-de8d9fc5dd8b/xunebuvogibepulikidimas.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/scurlock_elementary_school_supply_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/facf799b-f79f-4c33-9ce9-8a2237e5af08/music_maniac_apk_old_version.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/xasovewipeje/soccer_ball_goal_setting_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/android_9_samsung_j7_core.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/understanding_business_free.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_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 5364 bytes
SHA-256: daaf973294abbd3ae34df9798c7cbb30ba5e12a532126d729ddf72a341cbf52c
font_01_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 11276 bytes
SHA-256: 47b823d5af6928652daed8573ee4f02b71fbda149b13e8341a2c12d1f5abf6bb

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