Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68e4b64516fcc41…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 15:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d86908a131b938c21810215981211a08 SHA-1: 6cd9eed2beb624def1fe3cdca15af776054b8fd9 SHA-256: f68e4b64516fcc41cfc31031a34a75de76ef653cca313c4f9c689a37194c2cf0
134 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a strong intent to direct users to external, potentially malicious, content. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://datev.hu/ckfinder/userfiles/files/gifasigubevimubewaz.pdf In PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/93594371605.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613112bb7cc27---79318912727.pdfIn PDF document text
    • http://skncn.com/u/files/tafolekajerupudojamatiz.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/luzojegolafebogi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/212f37d9f05d5c13f7ec55d51818abba/joralin.pdfIn PDF document text
    • https://partnermind.cz/images/files/xabog.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/voxag.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210912_B3762FF3A8308C55.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/kavuximifupigizit.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/17241470742.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/33960765211.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/21642396443.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/dalasofadufetexemevapuso.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gamotunodaluvu.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/sowexiwesiratelajatu.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/85864773119.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/bofumilotinajugidi.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/jiloxitizile.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/906e0f0d2b701e0e9ee29221d5246102/1588531041.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5179_20210909031614.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/xapedolu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/robivigakikatedenet.pdfIn PDF document text
    • https://kawanmto.com/contents/files/86662601834.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/93422363885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tamil+dubbed+movie+sitePDF 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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 17104 bytes
SHA-256: be5fc7283382b179057e628c158f929527c645275814978269ddec1166f7b0ad
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 10472 bytes
SHA-256: f441d6899e093688f2f4e1ea1608f35bb956233f94751063c6546a9203a2af12