Malicious PDF — malware analysis report

Static analysis result for SHA-256 624ca515e12babc3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 03:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26e3603db5cf186b6e7370a42b96b2aa SHA-1: c7df0a7fca0c201f7eb8e84b0c2ebbe8ae0d3a6d SHA-256: 624ca515e12babc3877608b54d805e1d20200e64977287ada86edece9ad4af54
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 pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by redirecting them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://czyxchem.com/upload/files/4551132682.pdf In PDF document text
    • http://studioguagnoni.it/userfiles/files/39488925053.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/nagoxevug.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/rigonog.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/52058392948.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/10789719487.pdfIn PDF document text
    • http://eternoohydro.com/d/files/55431013352.pdfIn PDF document text
    • http://slsnn.ru/content/files/kexarupefujise.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/88263882504.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/84858823866.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/40099156532.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/mubatexurer.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/82815521807.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/37258265474.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/gesixos.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/wapibujizejatex.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1879905b---19183682971.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/mupetabapepuvopevofalir.pdfIn PDF document text
    • http://jfe.hk/userfiles/vevawevozuvesurikexub.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210905165533.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/61672332421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=phone+ka+gamePDF 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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 10144 bytes
SHA-256: d4c29d162ab00e9c9e8006adee15aa6557db797f5e9ab79f70f0cc4c15a45600
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16932 bytes
SHA-256: 029bb032739fe593c51113b6bb369ac22d72b9324dab6bc2de467502f44f8352
font_02_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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