Malicious PDF — malware analysis report

Static analysis result for SHA-256 33979d80bad305e1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 04:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4562a65a456b94a2724bb1458f26a8c SHA-1: 6209d306dd8aa539fd7474cdb39c8f4021817e0a SHA-256: 33979d80bad305e1549589d8086e3779f20c6cfd09c06598f1347c677b8f5c44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest a link farm designed to host numerous malicious PDFs, likely for phishing or malware distribution. The document body was unreadable, but the heuristics and URLs point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kisikana.hr/UserFiles/files/63364939010.pdf In PDF document text
    • http://happinessgown.com/upload/users/files/segonazowiz.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/19738959569.pdfIn PDF document text
    • http://orenprom.com/img/account/file/78597355644.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/wupolivogilevu.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/lubamulowodirug.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/56870740006.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rofazugo.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/16154654881.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/41381680046.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/gifokubemapakaroxa.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2c832f81ce1facebae69a1e4a878fc5d/70360001956.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/jawitijomotazuvonobi.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/mafazedexori.pdfIn PDF document text
    • http://chongros.com/userData/board/file/57355183017.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/ginisotu.pdfIn PDF document text
    • http://potlista.com/file/files/13166509495.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/duzarimasamupefuvebete.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/zajetisi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/71767770395.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wuzijusewejilaj.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/24976615130.pdfIn PDF document text
    • https://ijp2.com/contents/files/vimofodetula.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/pokamigefika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+call+voicemail+on+androidPDF 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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 17872 bytes
SHA-256: f3e5490a2af62890dab460da39ab607942b7f89adba5342b300db0a3ab7e059e
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10508 bytes
SHA-256: 5718e3aa6f60af27ecf8f08c0c3ada3a8347f2f6ddcd064bacdcc8f56d4c904a
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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