Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9ae0e7b80ff9c9…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 12:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abff847ee113dade00fdabe9a73b7060 SHA-1: 7f825e0277cbe68bad9ad29aea06c137dcf0f4cd SHA-256: 2c9ae0e7b80ff9c9e45bee920530de2edc34f67325b460a8fd8dfa6c15aef475
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection service. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution attack pattern. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=how+to+root+kindle+fire+hd+8+without+computer PDF link annotation
    • http://aceonlinementors.com/userfiles/file/mubuveleluf.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_FC4F233EA95AA709.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109061601237204.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/riwimunutiwididokedo.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/27814971939.pdfIn PDF document text
    • http://hkwwta.org/userfiles/wojifakubonopivevasodime.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/gifuzemon.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/25722514750.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381eb7d114f---95620060547.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/24210315070.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/jagulaxidikobivopipero.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/kotiteki.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/xejonato.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/63388804294.pdfIn PDF document text
    • https://hssanesteban.cl/files/vivosodit.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/mogomomeniboperisugakij.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/kirefuronezixokek.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/kumenopamomovawez.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/pozosodinebopoworurenuno.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/bafejunakivaf.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/lowamapare.pdfIn PDF document text
    • http://vit-physio.de/file/sujajinajafijib.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/35232398112.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/linixemelopizot.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_off0000c3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 17316 bytes
SHA-256: 6de633fd75f6a3a2fee114762bcf13361896a39c69b44b73c7f10160253b56df
font_02_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 11032 bytes
SHA-256: b7e9114edeae5d32e86f918c3b06f7e6add54d7437a8f5ab4085990ae4878a12