Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3b650c446aa044…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 11:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c1e61d3ea3f61f557b715d13fb4e5b7 SHA-1: aad07f415e21d888b1ccab1204bf5b1f58147e06 SHA-256: 6b3b650c446aa04488bb818c69ece02c643768c8bf5e01c704ec0081d05bcb71
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to a network of potentially malicious sites. The presence of a link farm with many distinct hosts and the 'utm_term_redirector=True' flag further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tcyy88.com/userfiles/file/2021091603153173499.pdf In PDF document text
    • https://joinvita.com/neu/userfiles/file/68614178517.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/79018211636.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/57781645982.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/33572278819.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/42236307690.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/96982455583.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/41548839779.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/sepewutuxexajuxifagen.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161412b85f31af---44677929315.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/vulewanegiwelegod.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210913042900.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/49648937444.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_98943C4DE74B5433.pdfIn PDF document text
    • http://bastola.org/userfiles/file/73805400223.pdfIn PDF document text
    • https://dafelia.com/files/tiputunuvafunugewovuke.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/33023280487.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/puduziraronuxopojugekuzi.pdfIn PDF document text
    • https://morabia.fi/images/file/80488775712.pdfIn PDF document text
    • http://bociany.sk/media/file/moleb.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/86669703340.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/29339261756.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/moxafo.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913141420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=assistive+touch+ios+apkPDF 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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 10460 bytes
SHA-256: 8a36fd6efbeddadd91b99ca0e0fb232744659ca08773e12798f6334c8a8a6a55
font_01_sfnt_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 18500 bytes
SHA-256: f8b513b8ac4370faf73f6cd598e9c284b33444ceb671ad218ab04de2688f7ce9

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