Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bac11291169076c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 09:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9a727046ff86b94760d05c423c2657b SHA-1: 76aff6e95d7517cc3200a0a8e95d6d670ba424ba SHA-256: 4bac11291169076c2c8f555f682735c072aae765de7480501a34a80d3e6f4331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on a variety of domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high concentration of links on potentially disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ltes.tw-goods.com/UserFiles/files/vineledi.pdf In PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/9461347423.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614689fb71271---tixilofelorimowusufonodan.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/609417214.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/bevunolegevo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/vetinigejepozutejikile.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/kikizadozejamepajeduso.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c4c36e75---vemofunomogikixifap.pdfIn PDF document text
    • https://energooptima.hu/upload/File/sijevawuz.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/45549043766.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/kuzakezas.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sugojalogagogabuferij.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/dufifunisiginilev.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/bewegukenizejepezivewed.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/2143061552.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/22384928186.pdfIn PDF document text
    • http://myslizdrave.com/soubory/76631618189.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/37183160990.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/80108340288.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/genoturow.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/56682152891.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/ninutozisil.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/72414562021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=call+of+duty+modern+warfare+2019+download+torrentPDF 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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 18136 bytes
SHA-256: 4a4e26c2f11716c68c9536a188fa4b1fcd77c8943fd9103af6dc0fb0ebde0ddf
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 11048 bytes
SHA-256: 69537e17316b8bf00db257da1d5e40a3e174835f40f552965bf95b4cb4c29b2d

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