Malicious PDF — malware analysis report

Static analysis result for SHA-256 a529c7ca4a0e60e5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 15:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a59c4206ca3392199b91e6299b85407 SHA-1: b80259dc0e98b5e1fb9ec9812925bc4e5c6736bb SHA-256: a529c7ca4a0e60e5575f057200210f63e8e052828973d488c961e987531e0e6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=default+music+player+android PDF link annotation
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/95361549665.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/wugotevafutijaronoreguti.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/vapokezuxivebeja.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/lavax.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/religivojaju.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/vatalarujonudajefa.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210920/files/20210920071501.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/favegiwapax.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631050456.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/finefosasuba.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/kotoliwujidudabaxalefetuz.pdfIn PDF document text
    • https://serka.com/serka/upload/files/newivukoburob.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/58667632297.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161342a4946ba1---kibedirabogil.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55a604f4e---5104299476.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/nukonakudogevoduj.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/85544462332.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/010755517624.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/90880990593.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/lesorikupepozinafiri.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/pulevut.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_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 10996 bytes
SHA-256: 78d345a8bc6d9f18cafa27688902a3aca23e0d93a70009dbdded5d3ee0acde95
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 19600 bytes
SHA-256: 935f8d772da1ad1a5993399766e8603019948833cf368605f0705277dd6da3b8

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