Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd87739d5302e661…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 22:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bd9219cdbbb9bdd6ab8ed4f6df42aa0 SHA-1: 5eb279a46284ff5548047484135af9da595d7377 SHA-256: fd87739d5302e6614e1eecf3c17d14c97a4cea92633153e68e02a742b7847675
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 or trojan variant. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate a phishing or malware distribution vector.

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://queure.ru/uplcv?utm_term=android+hotel+management+system+source+code PDF link annotation
    • http://factblogs.com/uploaded_files/userfiles/files/nulemero.pdfIn PDF document text
    • http://keitbg.com/images/files/11971782282.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/45906683678.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/zagegirazomatufuvobepi.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///88840067820.pdfIn PDF document text
    • http://pasted-radio.de/web/files/radevaxotezifodogudukil.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jutibumofa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16132edf07c6b7---73366573284.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/20144128951.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/41607374237.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/10210724196.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vamigutin.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613637d2cf9e5---wuronexozinipafijenobob.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/nulazinedego.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/940c1c3a7f66ef3ea16a81e3e132446e/83630625945.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/jidufebufalixulaga.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/wibow.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/bixevifupureg.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/balazipominofi.pdfIn PDF document text
    • http://salt17.com/userfiles/files/30374176212.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/76993026742.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/44219330601.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/wotexowubipewikinu.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/74320598115.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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 11012 bytes
SHA-256: 22c4f8734ef339d3d69abfbad288b6d2fbb5b4fc189e9e779788893842d96081
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 18028 bytes
SHA-256: 7ea79c60b330ba9bb73e56b3fcd9bf59e35214d3038d82c2fd45b9939d8ffd9d
font_02_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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