Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fc672e40f8846f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 12:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63c1ff19cc89c11d60d4ecef28375ac4 SHA-1: 4f08bd322ef420abdadae9dee26a1ccbdfab14b8 SHA-256: a7fc672e40f8846f36216de310a89d0220445d01d8aa96dda8a277bb0022ddc9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate software updates or files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://friend5190.xyz/js/ckfinder/userfiles/files/2139555267.pdf In PDF document text
    • https://mosallaesf.ir/uploads/ck/files/gapogoterulurudati.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/96180591894.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/44665641173.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/voratenidudew.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/76247425311.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/12785362832.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/59471174620.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/jogisimakafagujubiki.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/zazizomokewojoxezititaza.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/37733328477.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/womofegilabemigi.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/68049740961.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9fd45569e---jomepexovejimutovamumi.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gijesoxip.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/3033333028.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f539e784ca---kufedem.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/22595055000.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/56010396188.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/datezopanadage.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/vefoxoluso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=messenger+latest+version+apk+2021PDF 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_off0000b443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 10872 bytes
SHA-256: a0f87619bd15bc32acf96724c842d7d6199da8ffbcc92456a6c086ea50a84083
font_02_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 18308 bytes
SHA-256: 312062572add8f6d39223424f701841b53061c99707db82c32762a03bb5d3441

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