Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3cdb1a5d5f99fc…

MALICIOUS

PDF

88.9 KB Created: 2021-09-16 02:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 076df43ffa306379758fb6543a5b225f SHA-1: c8fd8f0e2ad59df0246981fd324c7092df768f62 SHA-256: cf3cdb1a5d5f99fcaf0622c1c6a551eadd205b7b2e63221e86ad9fab96ae036b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing operation. The primary function appears to be redirecting users to potentially malicious or scam websites.

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 https://pistant.ru/uplcv?utm_term=how+to+get+unlimited+likes+on+instagram PDF link annotation
    • https://intrastorg.com/userfiles/file/75203575366.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/43317685720.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/lotedugoma.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/60570228985.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a4ea6c325f8812a0950d4bf963c7ccdf/75743616662.pdfIn PDF document text
    • http://exim5.hu/_user/file/sifawibukip.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161351c82c45f5---senukuzorikipofomi.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/79225717263.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/79066424977.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/kujokazagixofok.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/68735510460.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36139284255.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/romofenajegoxubes.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/13508985057.pdfIn PDF document text
    • http://haai.org/upload/file/27053481491.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/29214074383.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/parul.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/73638983632.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/15413299014.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sesivox.pdfIn PDF document text
    • https://trainova.com/userfiles/file/mugubunovep.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/32245520254.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/4885574919.pdfIn PDF document text
    • 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_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 10860 bytes
SHA-256: b4992739a816327f88a03bf568f81a76595a65cfc7cf533d77f0f1afe10803f0
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 18112 bytes
SHA-256: 32d7ef78db686197112730770d54a6c9c9079667ddbbcc048c021a14dc08e886

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