Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce41409ed0c30d2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 18:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 701a4cecc05becd8158ceb927bd8aea6 SHA-1: ff5e254d11981ebfcb691a5dc589235ae956e7ee SHA-256: 1ce41409ed0c30d2b89a2dcc3390f5d95c8f1df2db87a7846dd0c0000955550c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the classification as a link farm strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=iboss+icloud+bypass+free+download PDF link annotation
    • http://asvpp.fr/pdf/wubizanog.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/3112379003.pdfIn PDF document text
    • http://schokozentrale.de/idata/21642536781.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8d62c509---46125845148.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/37020518997.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/tiloj.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/riverujegubaxoxe.pdfIn PDF document text
    • http://maidichike.com/upload/files/9205835485.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/25871491295.pdfIn PDF document text
    • http://oilbasaro.com/web/images/ckfinder/files/20210909023243.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/79900594439.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/58901955759.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/38472795216.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ppfra2aimpqmfb21r4m3sg4buq/bakel.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/15369226628.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/velumataxu.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/86644462165.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/76622714607.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/mutinenadili.pdfIn PDF document text
    • http://ping-property.com/user_img/files/zabajijekalopi.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/33328373122.pdfIn PDF document text
    • http://indexone.ru/upload/file/54984384548.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/69196505870.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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 10904 bytes
SHA-256: df6c270d883a346ab17989e836bc869fd87e72da44d631d5967c7cabfdd2b14b
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 18420 bytes
SHA-256: a11322f8ec9d417a0d2d4b437fca8f019e36e1fcbb23207f83614bff397b4cb0