Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc99d974fcb5ba05…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 17:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c92dfe780bdc0fc2ac16ef97226cf636 SHA-1: 94587061a3c8dbec96da36e05c50b24dbe5fed75 SHA-256: fc99d974fcb5ba05d0f0473367d05f68c5bd4307cd03f501f1304172c1d3bf95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, indicating a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution, despite the absence of executable scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kbchina.de/upload/26608315537.pdf
    • http://phamtrangia.site/upload/files/40654850528.pdf
    • http://rcsiprojectracker.com/userfiles/files/77661273371.pdf
    • http://cutskytools.com/d/files/37918786619.pdf
    • http://petrduchek.com/files/zofizixa.pdf
    • http://associazionemillesogni.it/userfiles/files/sosozukepososamo.pdf
    • http://bitree.net/ckfinder/userfiles/files/49932072198.pdf
    • http://solarissoft.com/img/userfiles/files/nomove.pdf
    • http://daming-school.com/userfiles/file/16020630195.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/xetefepobumamuvaxiv.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h75fq9hj6408m0vvrhbbk8rne4/muzusamusaxopalegureb.pdf
    • http://bestpokeya.com/uploads/files/61190520849.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/voguludojujimovewonusab.pdf
    • http://jtylek.pl/Upload/file/vevunozodumup.pdf
    • http://bigdoughpizza.com/uploads/files/22903359784.pdf
    • https://wspaperbag.com/userfiles/file/13751862338.pdf
    • http://sjzhtchem.com/upload/files/terozipefoluxafimavabip.pdf
    • https://www.natursany.com/ckfinder/userfiles/files/29653513542.pdf
    • https://korzo-galeria.hu/files/file/53199981965.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/5872698154.pdf
    • http://adance0112.com/upfile/editor/file/66848054400.pdf
    • http://www.jobibon.com/admin/userfiles/file/notapulovobabosebiw.pdf
    • https://samuelben-horin.com/userfiles/file/votakatatemi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+z+ultimate+tenkaichi+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 16792 bytes
font_01_sfnt_off0000ecf4.bin
bf961664b32896530a87973d619d98b69d0b4427140a1e276d526fc7b3103d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 11272 bytes
font_02_sfnt_off000106d3.bin
20f8f39df71343e61762acc7908656dbfee3ebe7afc0f0b3a93ea060194ef468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 17784 bytes

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