Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d43c12d85dd7d5c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 06:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0ff506e039e8766e6425077490ca2d1 SHA-1: 8c7c7a15f45c971f27ac4af806001cb4c2ea64ae SHA-256: 8d43c12d85dd7d5c6b9ed7ba1cfd3589cb138ca61bc374504f071bfff50080a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ptogel2.com/contents/files/rodatowavodudukesivupibak.pdf In PDF document text
    • https://martas.vodrsport.cz/uploads/files/ziwavovirux.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/zekasutujowidokuz.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/vagijetiwobo.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/tuzete.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/73180342610.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/poxalovavigused.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/dononadaxotafidoro.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/xubufuwidaziw.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/99768160433.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/rukijegidokupadidulozig.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/sulegilexufaki.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/84028500658.pdfIn PDF document text
    • http://signauction.net/userfiles/file/22277625854.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/56096127868.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b864c537c---zilomizujiwiwepizijopa.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/65111321938.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/99196496049.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/falubezipefojajemubure.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/xubipidurugosi.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/notegeveneta.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89554272833.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tutejokukojajeg.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/98078903624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hack+apk+telegramPDF 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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 15828 bytes
SHA-256: c189ca4e641b7d99a8428c8b4b5074d35f30bfff5998a5071be745696f74b50b
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10316 bytes
SHA-256: 4051a95c5db660a3cb718e2409f5a859fa5d5a9f31f311ed8ed343b69c0e98c2