Malicious PDF — malware analysis report

Static analysis result for SHA-256 13299f3759f2cd2e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 02:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7851cd9306141951912cf17182302d5 SHA-1: 18e4cecd49d028c384f648a46b9183541969ad4d SHA-256: 13299f3759f2cd2ebac5c295132471da034505c7b6d5e4a3469b7d023561d13b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=pcsx2+android+apk PDF link annotation
    • http://dorp.pl/userfiles/files/tovuxikodutijazunomepu.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/93780619473.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/kimefufidebirenariketi.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/13316227790.pdfIn PDF document text
    • https://angkalaris.com/contents/files/1506751801.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/95486166586.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/ponazep.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/rapikizenilaxigulirilap.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/vubazewabibazezinega.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/fugos.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/nedifowivasujakezuviv.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/8545095141.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_153332.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/11707924538.pdfIn PDF document text
    • http://safarang.com/basefile/files/dapojipalozu.pdfIn PDF document text
    • http://tencanpowder.com/d/files/kevawuxaruz.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/xubekimu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d479836263---bozobulawomikazul.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/45052951843.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/8444592700.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/31579657828.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/42471325466.pdfIn PDF document text
    • 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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10544 bytes
SHA-256: 905dc6cd2b77275e7b864773ccef2eef8f7d0d9c81a33aa0642929591df593e5
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 18868 bytes
SHA-256: 0e8ddbe3ba08373b23f6ba0b94ba378ee74848a7a5e9c50f82373609182fa3c9

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