Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d704b0b6673469b…

MALICIOUS

PDF

77.5 KB Created: 2021-02-20 11:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d696ec8472c732774c30e7c7438b0d33 SHA-1: 73f23caf455586345ad0c75c94f90f743a8cad8e SHA-256: 4d704b0b6673469b25e607964a257367f35112e323c3976eb1d3788d28b34bc8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure related to setting up a Samsung surround sound system, but the primary function identified by heuristics is to act as a link farm, directing users to numerous other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the main indicators of compromise.

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 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.
  • 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://maypoin.ru/123?utm_term=how+to+set+up+samsung+surround+sound+system PDF link annotation
    • https://xemedibapasuv.weebly.com/uploads/1/3/2/6/132695509/2043405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fc61f3bd6fcc.pdfIn PDF document text
    • http://webmastervlad.ru/kewigirutita54gr4.pdfIn PDF document text
    • http://znatural.space/analyst_cheque_printing_softwarexf5c5.pdfIn PDF document text
    • http://tryraisins.pro/how_to_play_the_long_game_dating1ytqu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fdd6f8c6a76e.pdfIn PDF document text
    • http://rusherx.studio/9829332166689t44.pdfIn PDF document text
    • http://topcreditmonitoring.info/rezorapokisanaxokod242x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5fcefc14d1c58.pdfIn PDF document text
    • http://kinorio5.xyz/norobapupiraog1a2.pdfIn PDF document text
    • http://cenderaoriginator.com/pontiff_sulyvahn_swordsfw26h.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
    • https://s3.amazonaws.com/kozewuposoridil/tetiwavebibumiruxuw.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/69950506347.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/lagu_boboiboy_galaxy.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/twist_kamariya_song_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/dukezarevubafipom.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/manual_de_usuario_chrysler_sebring_2001.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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 5236 bytes
SHA-256: 5436b4d362ac5fb69fc0a199e11465a8c9df3e126fd4a505fe0a6bce62f0ffe1
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10324 bytes
SHA-256: c8a28e97c4a79b447505c13f6dd6230aac0c1c2a45ea0796a31600bc9167590c
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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