Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfa522bff771889…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 22:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e14b451791bdd69be4e623b9897ddf2 SHA-1: bab260bed30d210f792517decd0b19af5e8a0743 SHA-256: ccfa522bff7718895f0a3a26f96e64637aa5e98bcc9054d19f777e3e38c69f0c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • 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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a25664bcea3049edb3428b3658229c58/97400809596.pdf In PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/keragawamefukone.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/10663424849.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/toxiruj.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/rukusovuvopewise.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/14655490067.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/papubefo.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/32073597174.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/96328342252.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kazosupifawip.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/rewupogepo.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/7933739262.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/93435941881.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/71067211169.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/pigizupa.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/15943054156.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/fubivuxovewufi.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109040909228036.pdfIn PDF document text
    • http://wdnederland.nl/file/62404395447.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/52166132922.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/62556167892.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/61998781473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+get+the+screen+on+my+phone+to+rotatePDF 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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 15736 bytes
SHA-256: bd67d2b0baa56879973236f27723ec4d14d6e5f2f26134fe150798e34c30f990
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 11104 bytes
SHA-256: 69ce71602d516fc69fea4e743885b9dd5257cc8cbb8e94b5d9961e2bde790083
font_02_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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