Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93053f262438e71…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 12:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baf1109e2fd27117eca510d1f1604332 SHA-1: 140804f2eeb60473fcc145c6bab0f12cbb50b0d1 SHA-256: b93053f262438e715490eba35069c463ae86236b35f40565910e39780886a3f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate it's a link farm designed for SEO manipulation, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=shawshank+redemption+streaming+service PDF link annotation
    • https://impulsa.mantareys.net/uploads/plantillas/files/75037967674.pdfIn PDF document text
    • http://strandedtattoo.net/file/76777599652.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/fuxitonofazoteluruxutalen.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/40iho4c9jqud5tjbi77roj001h/ladopim.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/48381269698.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nunewepojugetome.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/98579363360.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/pafalobefawedaxuli.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/36223177491.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/473923021.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7b6f0300---moxekepebosawima.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/wavulubejezinemuxaduwetel.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/venoginejet.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/70789700646.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/71982974769.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/52312474041.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/47429430230.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/7816602637.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/pipos.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/64139600894.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/koselimowo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/tofowadefamew.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210910_170029.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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 17768 bytes
SHA-256: 9a5c8ea985d181884c927e076402bcb4c7f8ccef8f49af3b87b7ab123d47d66b
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 11236 bytes
SHA-256: 03cd79bf41ac801affd2098e30ee1d81f780b14663d5b15a3a02a2822884450f

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