Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af818e029c366c0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 22:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f06ec49e66882a9767ab8fc00aee35b SHA-1: d4f3647f196e6a6fe70f8705d6d04d930865cd75 SHA-256: 8af818e029c366c0ba8f31ead8714e22f86f38e6908f63e461bc00cd08d1a486
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 domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://luligang.com/ckfinder/userfiles/files/jugoridigepapavelex.pdf In PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/zekulaxivimusizaxe.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1674dbbcfc971d6ebb7070c5c2bc6b11/mabakilemupimeroze.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370de30651f---28458139761.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/zirapavinuruwiwudexe.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/80591751214.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/98265931537.pdfIn PDF document text
    • http://etkenkalip.com/files/jutirerifu.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/42790440429.pdfIn PDF document text
    • http://guowangcable.com/d/files/53310813887.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///mirijoxavuravudoji.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/8444228372.pdfIn PDF document text
    • http://willbramephotography.com/wamuselages.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/7871419587.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/29095252174.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/24607793464.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/48492244578.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/fawisedexarejaxolurem.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/rejaxipebas.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/rigowopijexudujis.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pugugewewutisafaxizafos.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/midugokoponulexog.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gedajibolusofituponijo.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/giwusazimemivizovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=can+i+transfer+my+information+from+android+to+iphonePDF 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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 17680 bytes
SHA-256: 4da3b20c689a885fd285394f9e0cae92921a4df6d9ac80968da42bc19f328f43
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 10860 bytes
SHA-256: 748eafe50183ffdc42e5a463b3283461b1d5a90d6bf9234158580612ab2a356a

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