Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d77a7dbabee9f66…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 00:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95475d0d195f119036a01149602c9786 SHA-1: df7a3782b89e717711d2b03e00721bc070c6c625 SHA-256: 9d77a7dbabee9f663427e6176f9ca8591a68869ab41132f2803556bce0ae56b9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, likely for SEO manipulation or to distribute malicious content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=gta+gangster+game PDF link annotation
    • http://hk-bbc.com/upload/file/73694195346.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/zixorada.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/dejunexapetal.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/bijujonotigobetelejof.pdfIn PDF document text
    • http://ahknchem.com/upload/files/takuretifiripuri.pdfIn PDF document text
    • http://ministerium.pt/files/tupumibabekero.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/9896871755.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/52836808117.pdfIn PDF document text
    • http://pololanna.com/user_img/files/zuxiwawedimevusosiwofofe.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/81560065004.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/nuvomujezaxedarupakesipo.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/poriwevoxemogis.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/10819018178.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/50801115480.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/ramavisotafimuwaj.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/79224211017.pdfIn PDF document text
    • http://reylab.com/userfiles/file/damalovesobaduwezasopode.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/wijuwupefefu.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/94601606690.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/biwap.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/xalumu.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_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 10232 bytes
SHA-256: 01f9306c1a906cbd71bba67aebb52359a29aa1b4e7dbe65b5b6642037efcab37
font_01_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 19620 bytes
SHA-256: db39ab98c527ec19dd64ddac0e327a2de858ee2ec050ac44351df2082cbaa3db
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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