Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f916dc3319cbf94…

MALICIOUS

PDF

96.1 KB Created: 2021-09-12 02:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22b27c74cc5ef1efdbb2ed601faa1748 SHA-1: 4fd26f9ee018be00e07af4c6073735172e016cc3 SHA-256: 1f916dc3319cbf94f45c5399014a12a4c6e18d5c255cfca49c7df40da7698432
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=the+walking+dead+season+11+episode+list PDF link annotation
    • http://vrieshorst.nl/images/uploads/file/buzozukonu.pdfIn PDF document text
    • http://chicopharm.com/upload/files/gaxidetubokok.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/11224786096.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/getatodiwazojejeda.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/89323224619.pdfIn PDF document text
    • https://mangallagn.com/images/file/liganiwufufupedor.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/jatenugonuz.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/zezizinikevosipejifexola.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/buduzagapux.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d71339b27---37093303298.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/zejinevagitugaromek.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/31071327884.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jakux.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533e82f806---todafinejove.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/19501843129.pdfIn PDF document text
    • https://alutat.com/data/file/97003336291.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/rinotezexajinumimedikumif.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/dibepuvafedirirufel.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/wasinisawilo.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/7753357403.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/85110663812.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/98757683131.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_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 10764 bytes
SHA-256: 24334f4f940f6072e9f8976df3fdacdf36e05a67722ed29a38a9cc2186389507
font_02_sfnt_off00014182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14182 19136 bytes
SHA-256: 42bf6e8c587dcbe2702f0309fe854f6ac898be7fa2a0238967e951594423e318

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