Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ce4a116b7a2d11…

MALICIOUS

PDF

100.0 KB Created: 2021-10-06 11:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5f87f4889db2758fbacc303d3925be75 SHA-1: 8c2a57afb593dee2929e10329faf757d73469b1a SHA-256: d4ce4a116b7a2d11564180ade1ac8f21aa4193d96f89d7d6dcdd5fab760ce165
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content or further stages of an attack. The presence of multiple unknown URLs points towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://506hlapeta.com/files/file/wolegusugupexolireva.pdf In PDF document text
    • https://chasehr.in/userfiles/file/susofazavebujes.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/52528828666.pdfIn PDF document text
    • http://scsychem.com/upload/files/vegipupovukigigolu.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/77222982412.pdfIn PDF document text
    • https://clubon.top/uploads/files/gugewu.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/15638720953.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22330617576.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/46555917497.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/zatovipux.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/57277779998.pdfIn PDF document text
    • http://kccmaul.com/files/files/zigamugezikaferifo.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/24882664916.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/903664933.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/12777402629.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bf5a800405b3a929920c6b6925f6fba3/bexinebal.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/99464902985.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/rufapasedakugexarovipap.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210909_183748.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/67659805479.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/35090063182.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/timoxapusajigi.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/72679101743.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2tdd0akuktlfsl6h581cijbujn/18834817962.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/monavexore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=arabic+middle+eastern+musicPDF 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_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 22040 bytes
SHA-256: 75ca2f360d1f52ea85b5ab29a52c1a31830fc72860038baf7ca2a2fefa3c354c
font_02_sfnt_off000169ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169EC 10632 bytes
SHA-256: d343cd33c102f1f95bdc2ae871606faa8995c7d2d6f4b9752f691939248ee1b7