Malicious PDF — malware analysis report

Static analysis result for SHA-256 952de43adf1739e5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 18:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fb30d20a89a67b3f346183beff4fc566 SHA-1: 57cc4fb955e98d32c86135e90ba9ac60904f73c4 SHA-256: 952de43adf1739e55e5f3a59d4b810dcbb1087a78eebb272255cee020c2f8e3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sokolzgierz.pl/web/uploads/files/dategodomakege.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08b096884---72857768844.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/8261516108.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/pufiwira.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/90365380688.pdfIn PDF document text
    • https://mimpidia.com/contents/files/82053743651.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/98064906350.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/binip.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/50134938413.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/13034628029.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/libiz.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/18248563413.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/46835874.pdfIn PDF document text
    • http://esistore.com/userfiles/file/sezazil.pdfIn PDF document text
    • http://terrietanaka.com/library/files/33862554236.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8047d7394ec21cb74ce33c7e28861571/38701636806.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/22237311665.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/42913473484.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gozubagemulisele.pdfIn PDF document text
    • https://telorgabus.com/contents/files/72010510814.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/loterinejexajoreduze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=designing+android+app+uiPDF 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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 17200 bytes
SHA-256: 6fa9fe7801baecd05af0103799fd53d1773077587ebef2c37d05a4015c9a04e9
font_01_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 10524 bytes
SHA-256: 6b0e067ed9baa83906c691ce16c6590cb498fe98f2fd19c98bfce344153e67dc
font_02_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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