Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc2aaf65c759c55…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 21:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1131aad20542458abeac35ed811843f7 SHA-1: d5f7023bd229f53c3a53aedcaaed03964078e3d0 SHA-256: ecc2aaf65c759c5555da84ae725a4b8f446f0112470b7c8c24dddb55232a6bb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the true destination through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://jn-zhsc.com/upload/27908077167.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jkrt4ctpvlt2c8tokdlu2n2a9/fasixageb.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bimavafonu.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/jupajerirudidupage.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/99137061768.pdfIn PDF document text
    • https://apra.pl/files/file/41741166278.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/dabebikovogi.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/53984801296.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/tatidixuvem.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zokedenuvuxedupo.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/ninegorifosines.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/70746095302.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/xikitaduferoguvugizix.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091011102_367080043.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/1142822217.pdfIn PDF document text
    • https://kaisar168.com/contents/files/48747391045.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/mebizujowafuvenevu.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/muxefuxelikibirajage.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/gopokado.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/6621977853.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/57186217923.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/48887389188.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/mepazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=super+tank+rumble+onlinePDF 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_off0000ae47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 16064 bytes
SHA-256: 47cd391507a35e29bbbad52762a1ef6fda4ed8d349e0a8f1760e2841dc4329f3
font_02_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 10652 bytes
SHA-256: 0c677e2037cd4fd1ead7a6d954e41f1e787b1b159a27ca1f1daa5e55b6a9c26b

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