Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef4d9ac534d7acd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 01:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36133663bc6721ca3960d59930c6ded3 SHA-1: 0b44690cb67f5aa4226d51d0a93e5631d82d89f2 SHA-256: 3ef4d9ac534d7acd41acc3dbfd6b39f0d3ceb791ec3cd70a8a7cac7bf0ad806b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=multimedia+message+app PDF link annotation
    • http://digilit.ir/basefile/digilitir/files/21810190275.pdfIn PDF document text
    • http://didopack.com/files/83416819921.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/27527727165.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tolejora.pdfIn PDF document text
    • http://watch62.ru/files/files/38055554283.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_E392740CDD0C90D6.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/gemujexezamepawemiwezos.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109110658114950.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/gifaj.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/84998579166.pdfIn PDF document text
    • http://industra.sk/userfiles/file/koragugukobuziri.pdfIn PDF document text
    • http://sdes.in/uploads/31616894328.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f559d35135---zenibumopilujojogadomilo.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/70501351710.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a817d30e2f---xibewepitudalavaxosasera.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/vefatalijag.pdfIn PDF document text
    • https://kiptep.ru/file/wazozaxerimosigod.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/netokesesinuresis.pdfIn PDF document text
    • http://alvitraders.com/files/modelowigalejadiwexet.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/51632117069.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210917050044_Z2VkYWtpamFnYWxheHV3dQ==.pdfIn PDF document text
    • http://climtech.com/files/files/62260585975.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/kupanelovigik.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/lasasit.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_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 10504 bytes
SHA-256: dc355335fab6a9763f1df9d0339f4ffc55b358e96ace3eb0b0f7e2ccfdf1a0f8
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 16560 bytes
SHA-256: c75df241bd5325027cf72cabc019e31a14ad8fee48fd67243cc9abc65c9d26a4
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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