Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d0649f9f33d0ef…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 23:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 150054e06c7074bdcad5b2b603e9b1a1 SHA-1: fc4301428fac4167524005db6e479aea80648df4 SHA-256: a8d0649f9f33d0ef63c2050e2b4931531213e23a6f58f0bcbde818c9c32326e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a campaign to distribute malware or conduct phishing. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

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 http://lignumweb.com/site/webroot/uploads/files/52284000969.pdf In PDF document text
    • http://fizjoactiv.eu/Upload/file/vidupabotogelatimov.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/maminidumojanewid.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/62864426539.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sidefuwofuvujojarus.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/jisokukegewezimizobuwagun.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109170016381535.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/97241520314.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/67965482742.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161376760d6f24---44335350328.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/72548059724.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/bolenedamexulevusipa.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/bivafoxabilepobuxobo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210913_78E65553EE660A4D.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/bunew.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wilajisasuvifowagivowo.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/gokoxubivomegepoviga.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/87296925378.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/19351597565.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/41643539915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=reality%27s+edge+cyberpunk+skirmish+rules+pdfPDF 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_off0000ab47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB47 11472 bytes
SHA-256: 49a28cfc5bc64cb93f1086d161d62e2fbf84e769be478033c117bbae8f7b645c
font_01_sfnt_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 15916 bytes
SHA-256: b16880f5e07ecbd0554eb53532a276a83a72d8326925a8fee7d4e202979f547f
font_02_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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