Malicious PDF — malware analysis report

Static analysis result for SHA-256 bede5b21a25982fb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 08:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00375df804e34518f24d0c08901dd069 SHA-1: ffc824a9175077149b8ae33057af178204822a0e SHA-256: bede5b21a25982fb8a4112a17a49830996c53612087649e87644d99f66f59cdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, characteristic of link farms used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=free+games+like+mario PDF link annotation
    • http://dedanskecasinoer.dk/userfiles/file/90557455061.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d6d071a23---jiwufazuvinagimoto.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/3278458708.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/28703277848.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16137577a00ea0---kolitat.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/lisusowoferurebosirarisu.pdfIn PDF document text
    • http://msiutilities.biz/documents/85834732610.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/luzetaravawezamitekosofa.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/52759999677.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/rirerumekajakijulokirok.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/71317795397.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/27845535513.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vamoxowixubidatovu.pdfIn PDF document text
    • http://risme.vn/files/tevizaxaxilevap.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/36962803215.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/sajemo.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/13502673546.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/31070954286.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/79289791326.pdfIn PDF document text
    • http://jump360.co/upload/files/20210912020952.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/78979444509.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/8095937122.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/bagezekos.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 18588 bytes
SHA-256: 32aebc7074d47a57356e2b50053e043e0fd4ecb9336885681f9d26bc9b5bb277
font_01_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 10316 bytes
SHA-256: d02d56bf3a320bbc6c30fac88d687c6b355f04d2a61c36e6d3aa0abd60648451
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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