Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2498f7b769572f0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 19:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6359aec1df8b7399ce56cff921e706fa SHA-1: e66af7d51ad28822653bb901b696362353e354ac SHA-256: b2498f7b769572f00a19ce4719908f6195decbba6ecb045ae506e7acc76ca9c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination and potentially host phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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 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://phucatgarment.com.vn/ckfinder/userfiles/files/89713466282.pdf In PDF document text
    • http://cocoabuterol.com/upload/files/tabuzewenano.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/65516504359.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/xajixexip.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81618129923.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/31537432035.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/93604091801.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68555931537.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/86945314593.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/rusija.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210912134819_1987081409.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/22361136499.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/76783662353.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/73370823424.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/sikesi.pdfIn PDF document text
    • http://debten.net/UserFiles/File/1534421652.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5cdbc2a5---53952338725.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xuruk.pdfIn PDF document text
    • http://vucert.vn/uploads/files/95404547981.pdfIn PDF document text
    • http://baove247.org/upload/files/29853638885.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/lusebisuf.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zinogedinogomuwobixalijis.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/fijotolulufi.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/26549735497.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/zagafuzitevezanafev.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/59310820037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hack+gt+racing+2PDF 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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 17252 bytes
SHA-256: a82bf396f25f04287a3ad232b369c8324c2c930ff7e8c9fd40a05e960c2e4467
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 10144 bytes
SHA-256: d0315a69c021616f4aa4136e96ece46157eaaf0f1edc8067dd2dc92fdd57b1f5

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