Malicious PDF — malware analysis report

Static analysis result for SHA-256 139219b7697a054f…

MALICIOUS

PDF

91.1 KB Created: 2021-09-14 07:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c30cf15cbb0e8fa1201c764af9df0b6b SHA-1: 673aab4b4e4f1350a2f0a6569f11931c32fa73ed SHA-256: 139219b7697a054f3ae359ca2255fa55097ad50a8a41a67a225de6579a41b6a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://koovappadyscb.com/ckfinder/userfiles/files/wedefepupokinepapabiperu.pdf In PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_2B4C9746380B17E5.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/25907715750.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/90573540943.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/xezot.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/kizugaritirumajafaninabi.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/34123287796.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/97283434689.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/fibutonojiva.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/vevivetagilelagewonavu.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/81830434646.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/teraxuni.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/47101546463.pdfIn PDF document text
    • http://sinners-party.de/media/file/levetubowivuxuk.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/pobamedej.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/nederanozigaloxedigo.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/sasebonumuba.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/65277277966.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/fabadapebasagirivomataf.pdfIn PDF document text
    • https://avela.md/userfiles/file/rupusezajuxilotozekojo.pdfIn PDF document text
    • http://www.og2c.com/images/file/fuselijajixebav.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/xilenebofokubuzafadi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/gavegibodubudusuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rainbow+island+game+apkPDF 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_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 18384 bytes
SHA-256: 4051cacd691619cf79ea33efebeb136fd92c69cb55cea8e3e85bc1bee08ecd32
font_01_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14649 10900 bytes
SHA-256: 34583facc9053fced993a7369b8a1275f870276834321837144de5bbc156f548

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