Malicious PDF — malware analysis report

Static analysis result for SHA-256 797c2e6c662936af…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 17:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79baf66b4340b237bb75b446211bd83d SHA-1: 8455d8a2fdc5ceec5cfe54a8304d53ca4f45200a SHA-256: 797c2e6c662936afdf4c8496e3b775446d0a676bd282dd8e48e3217972f3f94a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed for disposable hosting. The presence of these links suggests an attempt to redirect the user to a malicious website or initiate a download. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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://anne-berger.de/sites/anne-berger.de/files/fkcfile/polamiwusujemob.pdf In PDF document text
    • http://noithatlekhanh.com/Images_upload/files/buwafipuxufanurojir.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/73c14d759a085a6422c724a53946f4e4/jasetivumapavawixaxez.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/gafojo.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/rumaribekum.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/91448622970.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nivodoposami.pdfIn PDF document text
    • http://novafish.it/userfiles/files/leriwunomo.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/42521387356.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/lusipigifakawigib.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/rakamonogafisukojali.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/6143120881.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/20298457000.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gemirik.pdfIn PDF document text
    • http://soupworld.de/upload/file/62615594686.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b391a058---39462124360.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/wemolopotiniditipimerako.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/54431035711.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/79631510280.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/zobuf.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/3988823022.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/6041808848.pdfIn PDF document text
    • http://abnicum.com/files/file/vebibuvijis.pdfIn PDF document text
    • http://rem-proekt.com/f/file/zejodukigafebira.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/menagulawatazi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/26354402825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+hogwarts+escape+roomPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 17748 bytes
SHA-256: 36aa2e678a489ddec0f4cfb113bde896725f7a4465a81b5c1469d9d37332ad21
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10628 bytes
SHA-256: e8a5e1092e0096e2710d3f906a68a57323b04312e2bfe56cca0bdc7e0aae4944