Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e406d574d342d7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 01:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f562b030d774f87d9d84532770e16bf SHA-1: d90484d3c6d22ce7a80071e14614947d4501d8cf SHA-256: 56e406d574d342d739873af3e9600d6c1f0df98b75afe51fad594bb8d192f4b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent. The file likely serves as a lure to redirect users to potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://teleinwestor.pl/userfiles/file/kabidefelezesadipusit.pdf In PDF document text
    • http://printific.com/images/contentimages/files/83811813983.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/jewudut.pdfIn PDF document text
    • http://istanbularicilikfestivali.com/upload/ckfinder/files/26584106529.pdfIn PDF document text
    • http://canadanur.com/resimler/files/bilofukojizen.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/18483847272.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/74811311160.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddcd41d7c4---46395863394.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/25694512357.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/golikisuzam.pdfIn PDF document text
    • https://zagi.hr/files/90190919449.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/wiwojisewup.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/29507303543.pdfIn PDF document text
    • https://elemonbg.com/Files/File/jibiw.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210915_055550_9094.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/demitipelegisoderajoj.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/zejunarititup.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/36759904361.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nitenupe.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/4571964323.pdfIn PDF document text
    • https://beaszemin.com/files/60964402927.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/67729174667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+mods+in+gta+vc+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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10724 bytes
SHA-256: 560f6c4a2d5bb8a09365102f25be772afb8d7472a234dbc9183609d8b5a8ba54
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 18136 bytes
SHA-256: 76cf26f4279b6cc3df0eb167c23a5f1c4a429db4ddad5c21b88bb6fd4b37e7b7

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