Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52c431caaeaa607…

MALICIOUS

PDF

96.5 KB Created: 2021-09-15 10:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c449f9f2896d81866ae826c5b50f7bb4 SHA-1: 867cbbe773bcf33a9c7716184fe64ed693eecf6e SHA-256: c52c431caaeaa60719e289dfb6b5aa8b34ee1df032258d1469a3d89b8c171007
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, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic of using many distinct, disposable hosts to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/58988888269.pdf In PDF document text
    • https://lrsinc.co/userfiles/file/28109571166.pdfIn PDF document text
    • http://keacg.com/upload/files/roderagetamom.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///sikerowokemevufila.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/pekikof.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/mowovowitisumamuriz.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/71990102009.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/61560760477.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/kukuvifuzojijej.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/sosakawofovusiwaremibarid.pdfIn PDF document text
    • http://servmed.net/userfiles/file/peretezovib.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/98890586878.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/legezawukulowurumuzobalan.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7021571f4---lumapedil.pdfIn PDF document text
    • http://ombs.ru/uploads/files/jaboxokitudipegus.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/xotamekeropuwepawafifudix.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_213145.pdfIn PDF document text
    • http://receptlap.hu/files/zokigagogisexebepotumazi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/6022295754.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/lufewerosudufenamadufeb.pdfIn PDF document text
    • http://fruitsad.pl/images/file/97551347207.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/dawikun.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/dugemonurinon.pdfIn PDF document text
    • http://newworldss.com/uploads/file/sukavatojobof.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/695a19c099c35e591d7b8be20b4840af/22414936681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=juegos+multijugador+online+para+ios+y+androidPDF 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_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 11068 bytes
SHA-256: d3c99fc83f39f45406fc6ea59e6cced1048767f09a20cc8e44e83de22dd4a570
font_01_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001423e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423E 19484 bytes
SHA-256: 91f5f0d735cb23153a308d35d83a69bbb6edb325adf263fe8b7daf78a506348e

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