Malicious PDF — malware analysis report

Static analysis result for SHA-256 687f0a0d6be6cca7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 16:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7273a3d3cc09f14d178e39f9efd1f513 SHA-1: db76d7d59df7bc69239c8fa5b71013b9141084bb SHA-256: 687f0a0d6be6cca7c9680b653a0692ac94b0f91075a5633435fadcb6c7b83adb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The ML classifier output of 0.997374 strongly supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nakipoglugroup.com/upload/ckfinder/files/buwilaje.pdf In PDF document text
    • https://cargotavio.ru/files/file/5493795223.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/64868485671.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/94287747160.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zesawodazofizepirep.pdfIn PDF document text
    • https://senfina.top/uploads/files/kosujuxaro.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308bcdf3323---38733396053.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/maxuwisijuxilirumugojaf.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/pebado.pdfIn PDF document text
    • http://k1a.ru/images/files/file/75354087399.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/89574123688.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/76723966771.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/tobaxafufetifido.pdfIn PDF document text
    • http://cold.lt/userfiles/file/gasiwesovufidetuk.pdfIn PDF document text
    • https://nyig.com/files/file/vumuwipupifopewabuner.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/46061563947.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/46899252575.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/goboxiriwala.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/88789042077.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/75175418526.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/86994686810.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/jexuzerimerizi.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/duvidimomofoxazi.pdfIn PDF document text
    • https://rintrans.com/files/21320491322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yoga+vpn+mod+apkPDF 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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10240 bytes
SHA-256: 860fcd103c04460b27485ff08c33bebe675290775dbb3828beadcb4e5d70e70b
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 18244 bytes
SHA-256: 5afbae8c96f7a3cc910c9ff6697ad8af8bbb2bc081443ed557c131e184101076
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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