Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ba5b2382f1f966…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 00:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 536e45506385ecdc2057011a39dccc35 SHA-1: 4fb6732e692fbb695b167afbb49b01ce9a995333 SHA-256: b6ba5b2382f1f966c8850bd2f55866bea528f1ad23c5622241eb0ba9deace410
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=niv+bible+concordance+pdf+free+download PDF link annotation
    • http://stopguepes72.fr/userfiles/file/logetitabogugik.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/weludaf.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/sozinofosiba.pdfIn PDF document text
    • http://synhbio.com/upload/files/48134266304.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/28975812507.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vapobawizidafafewuzefake.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/bokuvemusezukitugodiregi.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/suveriw.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/8942287454.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/zoxaxiviwedimekunekud.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/22848840731.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/85112322929.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/fonivojerevobajivebalapa.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/zudobilezaneruvoziponudat.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/77641807421.pdfIn PDF document text
    • https://777mto.com/contents/files/80405564997.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/rugomomoxavadapadude.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/difetepi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4f7e0a329537a18ae5ca6ebb0382d8b8/40434635087.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110611b8cb---50058250573.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_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 10616 bytes
SHA-256: bdef5b37200cb9b10e79c79a937ad8964a50c31fa06501349e24774ee132b890
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 19428 bytes
SHA-256: 3f8693c229d515a0330f10bf349661fdf9b3f592bba811fecdeecf7ec01fcfc5
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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