Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf556970214fd22…

MALICIOUS

PDF

79.8 KB Created: 2021-10-18 02:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ed9e68f2ebfc918ff3e4142eab9fbad SHA-1: 3857201d0b5a892fff959ede0c7d8bbf25827629 SHA-256: fcf556970214fd22cf7a13d2968c360b9e99632804c33716dc747db04fca6f3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the presence of many embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://paulogomeslda.com/userfiles/file/xuxozofobijoluwajekafu.pdf In PDF document text
    • http://tcihk.com/userfiles/1822141055.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///99662736839.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/85670971423.pdfIn PDF document text
    • https://blgjad.com/upload/files/52063586359.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/xifizukosefulexaler.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/35594235405.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/jezeja.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/kazateziz.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/12266473712.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/7422117168.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/10750316677.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141f86b7a3d1---46779385262.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1616cab04d86c8---38903577580.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/renevelididod.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/wulixetawixafenupinow.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/lepujadejobiker.pdfIn PDF document text
    • http://partnercable.hu/files/82538788530.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/9904554031.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/51122033981.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=wrottesley+park+natural+burial+groundPDF 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_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 11004 bytes
SHA-256: ab37a849ccf3d459e7c039660bd6e4af0cc5658a41a07f4c1dd260ec4a5fd2a7
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16772 bytes
SHA-256: 30fe9175ae0cfc67e6b0847f3925f76cc46f90138a027ae6d8becd613eeb3b90

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