Malicious PDF — malware analysis report

Static analysis result for SHA-256 913c01c477dd4e5d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 15:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a41b45d6df2c1d8ca52090769322adf SHA-1: 3437dd462f56f01854516b5d2ce9f4484f5d37a7 SHA-256: 913c01c477dd4e5d90b2275740649debb5572020bf89d7978124f34dbd9bc6e9
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting a phishing or malware distribution campaign. The authoring application 'wkhtmltopdf' is noted, but no scripts were extracted to further detail the execution flow.

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://medvor.ru/uplcv?utm_term=area+and+perimeter+worksheet PDF link annotation
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/91539272426.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/86852512897.pdfIn PDF document text
    • http://mutitar.com/user_img/files/69672664723.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/lobojukokomelamonijuzafif.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/sedoveziwabuwazolox.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/jorugabez.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/15243898674.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/a8glb86amka61q1imn97ifdimj/fotodelenagekisonevusosub.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a3ebabca---gobigu.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/buwake.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/85768502398.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/xuzivezanalokawokefonudow.pdfIn PDF document text
    • https://scriptdd.com/_file/file/3107327657.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lefisavomagevezejosomovar.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kudetaripupubukaw.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/75826667263.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/wotij.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/18548673996.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/67732053350.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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 17516 bytes
SHA-256: c6e764fa25a868c5a0fc17d3f58443b23dce17f76303f28a5c21f832a0b0f848
font_02_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10768 bytes
SHA-256: 763f01dc222053f49fc087af38fc3617c90aafde2b2d6ccbc2ea5da91eef8b4d

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