Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b64dd5f4585590…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 12:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea416e1080d39c168f30d580c93cf231 SHA-1: cc8757886f0ca90d830eb5fdd89d0937ad172d03 SHA-256: b1b64dd5f45855909f9da4c2f86a7910c49456ba8aa43654b934b65d28c32c50
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. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=what+is+the+best+keyboard+app PDF link annotation
    • http://snsi.jp/image/news_file/80436410590.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/januzotolubabagonakim.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/44258687951.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/95617915932.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/6891478582.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/69150022118.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/58905391004.pdfIn PDF document text
    • http://apart1day.ru/file/wukefi.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/88104571210.pdfIn PDF document text
    • https://servicepapik.ro/files/lizikutawaf.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/35435814370.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogelo.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/39079871542.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210901_145106.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/83269666099.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/kotajuzedolire.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/jodujafinel.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/zijawipavavi.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/19311518645.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/xorisazudedi.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/jeror.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a110ee9e43---sapamewutomapijebol.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/vunoza.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/dikepup.pdfIn PDF document text
    • 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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 10680 bytes
SHA-256: ba24c329403ec4f5c30c1c7b467668458ac7c600f23db36f1af2152fba252877
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 16492 bytes
SHA-256: 55044dde733e5fa4e093c1fd92836d1b618549394fb6d66ecc287322a5171704

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