Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fafea799f58d60…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 03:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 751718ca53f7fb9676c190fea79a90dd SHA-1: fa2afb5280c5e009c4fe2bbe0c8ecd9d1fc19d6c SHA-256: 98fafea799f58d601d137746393d8ea3b4063bb450eb54c0ac4233f5a60ebc81
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest it is used to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://amt-alarmy.pl/userfiles/file/17552277750.pdf In PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/t4ev7qcq3f6jkek6uaq4vkn5k7/zegusejoken.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/43780625456.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910110149.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/topamexuwupewoduvase.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/18516216854.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/sukanegapezonolotituxuluj.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/kitebafiwipu.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/16641652791.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/nuxodapi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/nexukexofed.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/1696341009.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/69945412538.pdfIn PDF document text
    • http://manu-transport.com/documents/file/9605079959.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/91931335482.pdfIn PDF document text
    • http://freeski.hu/freeski/file/85519505063.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef20472e90---zolazexobemi.pdfIn PDF document text
    • https://protrialse.eu/files/files/97232634902.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/45368864690.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/36092491332.pdfIn PDF document text
    • https://pindimana.in/uploads/file/26827860027.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/beguk.pdfIn PDF document text
    • http://actinq.nl/upload/file/1574615513.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/38413763480.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/71578572791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+turn+up+earpiece+volume+on+androidPDF 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_off0000af18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 10752 bytes
SHA-256: 108617cf7387b69c1b1b891391324376ee30d47b78155f524001ff84496eefcd
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 14936 bytes
SHA-256: 0a832b03dd8dfa5ed750b04101a05025cd11f87746f2570c3d6306623c084f87
font_02_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1