Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e9c8af0ed34bb6…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 19:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 788f4e2d77ccbb8806120592da26fa4f SHA-1: 0da358e0b292e7ecfb1c22a364c5e3b568b496ab SHA-256: b3e9c8af0ed34bb653ff4c01c0b7822ba40ab5fc69648d1ab53b8b4b0136ba89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing and advance-fee scam lure. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a tactic to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of a Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=watch+billions+online+free
    • https://www.naabelectric.com/userfiles/files/93064160388.pdf
    • https://alnahamgroup.com/userfiles/file/wobajezo.pdf
    • http://veganogle.es/uploads/ckfinder/files/puxakowi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ebaa94749d51b1af4a3ab905533d1454/90076364613.pdf
    • https://mmrh.myagenda.cz/pictures/editor/files/93581659546.pdf
    • http://rc-modeller.se/images/file///550746654.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/lafigumotuvesijavi.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/8808112936.pdf
    • https://distriparkbotlek.nl/userfiles/files/56655067057.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/luzorabe.pdf
    • https://meganimal.pt/site/upload/file/futirarimi.pdf
    • http://yetisirkaucuk.com/firma/files/50918075533.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5fdfab8a93747c90cbcfacbcc995bff5/99796429604.pdf
    • http://0575zl.com/userfiles/file/bujupatibagan.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/zodurenizeguxo.pdf
    • https://designsdubaiukfashion.com/userfiles/file/12653729312.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/voxerowosudivimepirexibo.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b9b3dae8f85b0f5a92a73bcd575299e6/milaxamotudobivubog.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a661765f683fe3e8d86604d6d66d648a/rasuv.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/75359110565.pdf
    • http://candientushinko.com/images/file/mevilusirijitafubolevinuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f178.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 16792 bytes
font_01_sfnt_off0001098a.bin
96cb2aba43489978b14e10bf558b946a37eaa375ec03a7ba4d23fae4cca3b5e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 18600 bytes
font_02_sfnt_off000139f5.bin
61a1c38ea388a0bdd844a8e48ed87836627509e27482172ea06f663de4b4c991
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F5 10568 bytes