Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abeaefec81836e2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 17:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 895a11ad58f8be7253b23ab50122a67b SHA-1: 6e389acbbb679801cd49c48efa5f75b3de1604cb SHA-256: 4abeaefec81836e25872c2cb0244a3996f2bd6191b86348473ad4dbdce9a700a
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, including one pointing to 'smidgel.ru', which is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to obscure malicious links within a large number of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=free+novels+download PDF link annotation
    • http://snft.ro/media/file/45536280658.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/56703153177.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/levuvimo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4056f92e595d96a880d68e70f8b2b81f/58997444665.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/wafotuzovo.pdfIn PDF document text
    • http://linza-market.ru/upload/files/navunumanowof.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/35740388946.pdfIn PDF document text
    • http://nineslash.com/user_file/file/32648211571.pdfIn PDF document text
    • http://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/pusiravumobazabe.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxowifelimuwozoniwu.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/paxemimenetaxeserek.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/77198407973.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/fudaduwewodapijib.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/94552885300.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/gesoreginifod.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/39167848077.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/40672200079.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/xajilejaruzinuwa.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/61780964056.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/92484664688.pdfIn PDF document text
    • https://limsurempat.com/contents/files/ruraxinamujazepavore.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/zikewile.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_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10180 bytes
SHA-256: 3521888638362534ed8b6812c6a9756a063ed7be7c0f18829436b9e926828bec
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 17836 bytes
SHA-256: 3570880f736c682f630141f38fec366851db872a8224dcfbc7651eb8137cb677

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