Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadb784b2d3a2dd6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 15:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29731e0b84a6edc4b3e5a0ea29535c1f SHA-1: b5fab2e1fa27b0e220d40a55fde453588bac64b3 SHA-256: dadb784b2d3a2dd69dd5bc35eb454b64b7da280bfd9c08060b49892880c760ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to domains that are part of a link farm, designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, and the ML classifier and ClamAV detection further support this. The presence of embedded URLs suggests an attempt to trick users into visiting external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=movie+hub+app+free+download PDF link annotation
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65566999697.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/78039061387.pdfIn PDF document text
    • https://eternalbliss.net/file/fuxukobe.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/86362201911.pdfIn PDF document text
    • http://unsersohn.ch/images/file/29752926377.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/78356402933.pdfIn PDF document text
    • https://hiroyoung.com/data/files/nogemoj.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/65398984247.pdfIn PDF document text
    • https://architektor.ru/uploads/file/suvolodam.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/xarenubimul.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/74854418248.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/35475937446.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/lovumijegemolegel.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/tumugoxijuler.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/paxevagijo.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/95719978733.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/raraxefulovawufi.pdfIn PDF document text
    • https://shevian.com/images/file/16589220510.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/luvezij.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/74997165564.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/gifokijod.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/1321892021.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/4179042491.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/donidilexar.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/fumagodudesaluvemoxuk.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_off0000af98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 10716 bytes
SHA-256: 2ff9d256d820b42db67569f1e7641aa548c4d1b97f6ff0a1ba6d4c98d0328e25
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 16024 bytes
SHA-256: 6da2c6332b37fe7c2b545800dc620cb98219709088284f6254ec9951b88615c3
font_02_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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