Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a7e1fa34d75679…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 18:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0427095defb9ef75651dcd4fa2e502c6 SHA-1: 4a750ad9a6e0701afeb64192857b5ef2e058613b SHA-256: e2a7e1fa34d75679f62f1bb79f89ac5720adaa50cfef492f49105ae36ee0307b
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 disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=forge+mtg+android PDF link annotation
    • http://hkwwta.org/userfiles/sataziro.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/28571755185.pdfIn PDF document text
    • http://guowangcable.com/d/files/wamipomapowa.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/gezuwufapokajujo.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/38840256022.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/pojazofobazogarurapebir.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/11821929045.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/burekotetarubukapixufa.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/sitotexuwinuzujajom.pdfIn PDF document text
    • http://zamaro.info/images/fcke_files/file/8689190984.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/zitij.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210905_91DE4566AD27C390.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/kupilawo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7c2703a576683cdfcc24d3ecfd783736/14745399984.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/lesisalitafuzos.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/fobobuzi.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090717121973499.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/13896793827.pdfIn PDF document text
    • http://sushibelovo.ru/files/98068147797.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/38736014399.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/59898398555.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/94453046382.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eeb86d1ae---titozetijewiwuke.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/60426161831.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210910_211127.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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10352 bytes
SHA-256: 369bce628c100512523df702f6ab1c5c41b3c5ca2bca37d986064f48cede49c4
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 18616 bytes
SHA-256: f9509a02b9651c044e10599481a3cbc32077b7e3902867d70766e3fa949a2415
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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