Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4f0fcfcc942c98…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 00:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9adb12cbfb6b5e314ebc68ba4ab7fb9 SHA-1: f9b745b2e7b68574ef2449fd72be8427e9f3fd25 SHA-256: 3d4f0fcfcc942c98ddd4bb8bb34267e55acc1c822cfe4e07efcca69460c50e35
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to trick users into downloading and opening malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hcstonetw.com/uploads/files/202109062004329274.pdf In PDF document text
    • http://theheavent.com/userfiles/files/80749329893.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/luzodituzusoz.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-12/20210912012511939086.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/47638884611.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/jesitokerepasumeka.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/putofipidobilixafuxaga.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/zekajizejopow.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147995c5cabf---12081157137.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/5844424487.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/nikakexirenutujuvokaw.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vatewejomirinoxod.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292c057d60---dedofudigiwivibemarawu.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/fovovakikadixufajor.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/keretumovitodusezimoruri.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/tujikajoxanitifolox.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/64103459694.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/rodepodizegosev.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/95734390256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+ds4+on+androidPDF 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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 10184 bytes
SHA-256: 3616dd2ca68ffadf41b6b0be20711d5f0f3b47fa82f9f4841e5436b9ccaa081e
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 17928 bytes
SHA-256: c07ec24bb12a4f60c737b4634fa0f39513fd86eecdcf5627ceb2f07aa58f16cd

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