Malicious PDF — malware analysis report

Static analysis result for SHA-256 927dc76e0dd53fdb…

MALICIOUS

PDF

89.3 KB Created: 2021-09-17 11:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd176666d0d03dddb89c08b262bd7192 SHA-1: f469e8648a9077c834796d0c38551a563bd8ed7b SHA-256: 927dc76e0dd53fdb0db478063bdecefac544ecf4f33290f24f6ba129533fb2d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and multiple external URIs, suggesting it's designed to redirect users or download additional payloads. The presence of a link farm heuristic further indicates a malicious intent to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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 http://aaas.handyfriendship.com/upload/files/laposexugonemitupa.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/27536798282.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/6692297982.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/22196625864.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zosibejuwexogow.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/38881324282.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/soputeganexovibesir.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/mugodofozudu.pdfIn PDF document text
    • https://digireg.org/upload/tivimelalurowim.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/21353751622.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/nolizizopa.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/72018228.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/96561970159.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/doluzaranilov.pdfIn PDF document text
    • http://generoussecurity.com/uploads/tabig.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/84491131360.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109132100477869.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kelewidaxoji.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/kotufavawijozuwom.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wezodafuzogewarogipidixex.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/83374356960.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/8982147708.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/river.pdfIn PDF document text
    • https://dafelia.com/files/82583344474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+car+player+theme+downloadPDF 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_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 17808 bytes
SHA-256: 56aca0455be4503e13548f31dfe77fadc14182ffc46fd077facac927148c6e1c
font_02_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 10792 bytes
SHA-256: ecf439c8b8b1a19b8ebddf76012510655bbcf4df0d088c83eff32a63de0a7f8d

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