Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed14f7f6166c5a7c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 15:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aad44f921d576001c92583ac8b76f71b SHA-1: 6dade82400f88c79161fd819a6308beee0df407a SHA-256: ed14f7f6166c5a7ce03716948778c5f658f2eeafb9639133a0dba2a5ab6183cf
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bugskin.org/userfiles/file/46666682850.pdf In PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tovarupatefuxad.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/70671140557.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/84587310124.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/dokikepibepumero.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/83141820986.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/46236994736.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/ramovemup.pdfIn PDF document text
    • http://nemochem.cn/upload/files/54054384564.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/98378064945.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/jaremavalivibetiwopid.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/gonoro.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/kozevosebuzoduni.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/jujenebijenuzefaju.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/16017756035.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/31734649494.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda1a074b---84670575451.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/1978354739.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/25150284473.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/adbd30f774021e647f85fc227a5c4e11/25705214640.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/20700232749.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/runilesupifage.pdfIn PDF document text
    • https://laps.pl/userfiles/file/51680304571.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/3068522054.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/49049777212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=formula+car+racing+2020+mod+apkPDF 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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10872 bytes
SHA-256: bc756ef96e31b3e1b7912c6bcd4990164f064cf44c09b4f45a15aacf70d5305e
font_01_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 17964 bytes
SHA-256: e3cb21f2cedeb8be492a66c3a81929c1b90bae633fce3ab25b93d3227ece0ba0
font_02_sfnt_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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