Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9c59b196e9929a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 17:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 328410eebe59c10c15fd641980d3d5c6 SHA-1: a37ec195ecf44fcb41c69ccf50abaee0af76612b SHA-256: 5f9c59b196e9929aeb3f5cf3f836c225b2c2bceb68b42fa33959478f9c6074f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files, suggesting a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, likely to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://papienbanana.com/user_file/file/96839002865.pdf In PDF document text
    • http://uticachemical.com/files/upload/files/81096755789.pdfIn PDF document text
    • https://equalland.com/uploads/File/rovikiwipefibofobi.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/52686927431.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/56347820675.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/42228234950.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/melozomax.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/vubumimiboxumisesavowuvo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09f39051cc6091367d732a480c88ca4d/sejumabuvimixumumegatu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f601c4f102---fejazigufobimedugig.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/runolekagokulozojobixujaj.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/manuvefofisozenur.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8988667722.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/16824173603.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/ginasizepibatuf.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/78986521255.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091400463073499.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/ruwufizirofegiluwafofa.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/20053799506.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/12848895924.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/19968848834.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/37505797456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=zaku+live+appPDF 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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 9876 bytes
SHA-256: 3810cadb940449ba87ba1d259c9ac65ff900e54f7631ab07a99990df98a084ef
font_02_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 20736 bytes
SHA-256: c2c1c03764718472d90a348fe9eb949a70ef91ffdfbad2e75a4a269fdc8783c7

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