Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd0212e5384499b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 19:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b3da034055b9da4d05f46925b1e3b57b SHA-1: 53f8d40531ba1aee7725fc7541e5745b2f4f35ac SHA-256: 8bd0212e5384499b5b2555c8ff51312f999a72706f8b162892d110ea3aafbd6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through redirection. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malicious content delivery attempt.

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://nomylo.ru/uplcv?utm_term=high+maintenance+season+1+episode+1 PDF link annotation
    • http://farmaciafoglia.eu/userfiles/files/laromugodajafifinafupitu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/zolunuxugapagid.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/nebuzikanudomumiji.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/89323517449.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/70107298704.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/fijotanenotifup.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/75171022711.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334018d2861---93245527590.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/sakefigigaxenumibajesovu.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/35206445853.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gijizajowunejasenaduju.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b859bb4e2---75727441170.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/86649811845.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/99491998128.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/notubawumidotozem.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/jomubuzalo.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/20825210380.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/94897113556.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/teferipowadogokuwoxidola.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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 17956 bytes
SHA-256: 80eff3b608fc648a6c7239c40c16fc28a106f8ef826f7812f24a5814b48cadf9
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 10856 bytes
SHA-256: d6817392ea68182ff67247948dfea1ff2bb384771431065f8d88273417708a16

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