Malicious PDF — malware analysis report

Static analysis result for SHA-256 4107d6c3b0d925ff…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 21:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53140974571206208bd6197adafbddce SHA-1: 7146fad5caf59e080d4a0196ae0e935de870e5f5 SHA-256: 4107d6c3b0d925ff93e6c1db687edc94e48cb715fbeb235f8517a78506cdddff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and configured as a link farm, suggests an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://falconfam.com/ckfinder/userfiles/files/fuponid.pdf In PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/88414687034.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903225103.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/lofekexezinaduguxexew.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9986410307.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/48477282972.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b673ccdfe---bajexonib.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/62686487946.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/60107671865.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/47833691414.pdfIn PDF document text
    • https://andana.us/files/files/77461452819.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/78935263191.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92352853338.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/96805919579.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/34516175307.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/79467275866.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/tafazolevututizuw.pdfIn PDF document text
    • http://wdnederland.nl/file/xopidinolab.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/foxoki.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc618a3cc---wunile.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906023211_1694938745.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/15304621471.pdfIn PDF document text
    • http://inphilong.com/upload/files/55795409827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=8+ball+pool+cheatPDF 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_off0000c5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 17020 bytes
SHA-256: 7e9fd36e290d5db6fe2007fd4a7de1816b09295a3e8be5b484cb64c6df66acb2
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 10260 bytes
SHA-256: 4ba9ecee003cd5c1510f09ec9b3754962959f3b56a55826c2f1a372fb68407d7

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