Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fdc4967207054d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 10:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2c62a824fd05de3826db10ca7d79f64 SHA-1: 9620bc1518ef736f5b247925f1a348be7fb36377 SHA-256: 61fdc4967207054d6f8fcf3b191738a5e45c676b821f3675e1aea613f0b76c5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, with one heuristic specifically identifying a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141433e77ae4---bovapimidez.pdf In PDF document text
    • http://deurenhanger.nl/userfiles/file/gaxafabibeja.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f304b1762d---1561557563.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/46777638742.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210913165215.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/tisurijiriziximapiwebu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/47311414563.pdfIn PDF document text
    • http://hueide.com/upload/files/88780550957.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/7987079256.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/pifibeneva.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219414230.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/92652326877.pdfIn PDF document text
    • http://yongqingtech.com/d/files/83443352155.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/vegagoparufo.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/44035510384.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/73960613403.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109091834013865.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/gatinojerisajozur.pdfIn PDF document text
    • https://botroul.be/uploads/lizezozagadif.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/85164197792.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/pomedifajogisufoj.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/50719584024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+get+out+of+safe+mode+on+my+android+phonePDF 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_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 17620 bytes
SHA-256: f4a67fac63137d682d6a43c095a7632edd65ac5b77456788b97f519418fb44f0
font_02_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 11192 bytes
SHA-256: a5f0aebe32dbcf20a94e64296661c049855943d0ee13dfeeeeba5f1491b2bdce

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