Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af848d9a9aee858…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 17:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c659f316685dab23985d95a8cf4e3b4 SHA-1: 8c234562f32eef55966f10b63dc858b106279872 SHA-256: 8af848d9a9aee85850753f65ac44add273a63f2d37a55ac00f9564b6aa5e9a56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm designed to obscure its true purpose. While no scripts were directly extracted, the nature of the embedded URLs and the link farm heuristic suggest an intent to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://stl-log.com/htdocs/cljr/data/files/80943180368.pdf In PDF document text
    • http://hataylezzeti.com/resimler/files/kuwoborul.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614bce15e4226---39018889243.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/75538081083.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/fidon.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/64471595387.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/49258462086.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/11464740668.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/bodudot.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/gopidekujekad.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/nusirunutejulosofo.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/pepuv.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/6691513274.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/bijegirumuxewejamu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/73392569436.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gexepegigu.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/91476942847.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/wupobijasagufamajunija.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/50097815498.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/85469461096.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/9309180521.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/riwamivare.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210924065437.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/lorogasinenumogimofu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/rixelijotikivisiri.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee181b6e3---66528308162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kar+racing+game+hackPDF 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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 17336 bytes
SHA-256: 9d2e243fc02e8839c126fb198cdc8d695762ce9128e0537d52b2b3bf933bda61
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10328 bytes
SHA-256: f374e53db43765eca7bf6e215f8a9281cc00a163cb0063040d5e14c5135794ca