Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d04f8750ac31b0…

MALICIOUS

PDF

74.4 KB Created: 2021-10-06 23:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8c28984b1f2f04f1393c388052892535 SHA-1: afcf8b7b405eb040f5daab64b86dc28aa6d37300 SHA-256: 56d04f8750ac31b03f5375e92bdf090fd362530438687e4588f486e452097778
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a deceptive structure for SEO purposes, likely to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=check+out+fee+tenancy PDF link annotation
    • http://hotelclinton.it/userfiles/files/745910570.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/92237773563.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/73224976463.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/mebof.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/50356634228.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/kirasam.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zupudeb.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/46033925827.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/supobutimosofi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d29cf1d5330bc419ac6c09b8f7d0beac/setekisekasaveb.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zutunenavavixevuruxarek.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/toniganig.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/milabobadatabigarejezuja.pdfIn PDF document text
    • http://akvarium-olbrecht.cz/upload/file/14323792818.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/28806872344.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16152328900888---97159858148.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/7781870626.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/97155769596.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xezuso.pdfIn PDF document text
    • https://kawanmto.org/contents/files/41998725804.pdfIn PDF document text
    • http://ellev.fr/upload/files/32882066651.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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10364 bytes
SHA-256: f41924ca05aa669418a1f3b11b111ac02b26cc33c0e6a78d5a69376c8e2dce9d
font_02_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 18084 bytes
SHA-256: 02ded5696eb6ee37cfc031308b19f396dd834ee7c4c6a400db85407112b3db1f

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