Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f8d0d47fcfa82f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 05:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e24755c2261ee69213c1a0c67edcc4a7 SHA-1: 24494a28fbd142875e50ffad43a99dfd2a4bc969 SHA-256: 29f8d0d47fcfa82fb5dad2cd068743a2bfea74922cc9245bec81a3508d883894
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://grnca.org/img/files/files/73408230504.pdf In PDF document text
    • https://taumed.kz/upload/2021/09files/210901042454271265erzu1.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nasalefidugefavo.pdfIn PDF document text
    • http://vhshf.de/File/66668499373.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5580b3f2---93483071428.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/wudexeziku.pdfIn PDF document text
    • https://izr.fr/files/bowekovemuginitofinabo.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/jajiduvalejevejisil.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/35209069502.pdfIn PDF document text
    • https://dcimx.com/files/61101585502.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/gobozidonawekilanuso.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/52271039408.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/ligejusawumigugidiluza.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/41e1f3a929bd358a89c80a009b8155dc/fuferumenix.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/40598315361.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/wepimefubetoku.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/65702261586.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/vodomuzowe.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/19255018151.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210909/file/13319340485.pdfIn PDF document text
    • https://derfo.info/resimler/files/wumubigoviwarirelorina.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/lilaxudaz.pdfIn PDF document text
    • http://techmechengineers.com/uploads/5687920719.pdfIn PDF document text
    • https://isosklo.cz/uploads/56324240455.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/12297381370.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/jutofuwidumefuvik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mlusb+mounter+unlocked+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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 10908 bytes
SHA-256: 40c9f76964be727b1c8710064a77d55b5023ecba8ac996977fb78b47ba98081f
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 18700 bytes
SHA-256: a21a738e70cfc3801346a74bd69bef3476b58b35fd296d6653729da9ee5fbbbd
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1