Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0e30966adbb584…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 15:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83aff0ac48e2f8592f2e693d1b6b304e SHA-1: c57076f2149667b3950ebfe2049f6b7e4ea7de5b SHA-256: 1c0e30966adbb584ccd813932e9e9bbdd611a7dbc6dca1cf28a58e9797389e9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URL points to a suspicious domain, likely serving as a lure for the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=los+simpson+tapped+out+hack
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ad3f5da4a8b06693b1029f580310e8f0/ruruxanuwojug.pdf
    • https://basisangka.com/contents/files/51921841978.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/lalalevalagiperalil.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/luxutifexomupurulidat.pdf
    • http://tuzvedo.hu/elemek/file/panosum.pdf
    • http://turatabor.hu/media/bupikupi.pdf
    • https://hgb.se/filer/file/gapalibusa.pdf
    • http://101eyewear.com/luutru/files/nilik.pdf
    • http://thepokewave.com/uploads/files/13156631057.pdf
    • http://hrzservices.com/uploadfiles/file/xesewep.pdf
    • https://mldom.xyz/web/img/podborky/files/tenosanavimibob.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/jezatosiwuvesem.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-12/20210912083415262108.pdf
    • http://vivatbacchus.hu/files/file/99000365300.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/biwomozi.pdf
    • https://bruceleevideos.org/images/file/ruvip.pdf
    • http://studioagm.it/userfiles/files/98664632131.pdf
    • https://questyme.ca/userfiles/file/61156985743.pdf
    • http://glavis.biz/userfiles/file/24238563506.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/3175784810.pdf
    • http://madmojo.com/fckupload/file/47788574367.pdf
    • http://vtvxm.vn/userfiles/file/41450559339.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac79923d88---givejagiteja.pdf
    • http://sayarbobinaj.com/file/21950994946.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ce.bin
25bd2df87eb8f0babdd2471a072f020f9e7ca06f82dd6570484421f6c2366636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 10780 bytes
font_01_sfnt_off0000ee73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16792 bytes
font_02_sfnt_off00010685.bin
3b48e57f8dcdecb45432bceacea84d088ca0790184c3f44b3f43f039ada0f2c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 20012 bytes

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