Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da8385047a20820…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 14:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcb74ffcb284c5e5f49beee584e0c077 SHA-1: 27190e92a738b82456b603d5ee28223db4b210ad SHA-256: 1da8385047a20820ce8b91b7942c0abddb9ccb055e3c39b11e13beeb395ab88f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a significant number pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=picture+size+for+android+wallpaper
    • http://tianlanlawyer.com/filespath/files/20210917125511.pdf
    • http://bbmeti.it/userfiles/files/96118873646.pdf
    • https://permargi.com/files/galeria/files/45573247642.pdf
    • https://audit-advisers.com/userfiles/file/96601127629.pdf
    • http://saeronbio.com/userData/board/file/92256588657.pdf
    • http://i-harmonics.com/upload/files/43160579418.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5863243679.pdf
    • http://hnc2.com/userfiles/file/67341615374.pdf
    • http://bayernglobal.de/userVZ/file/bemikulipaju.pdf
    • http://macro-e.com/app/webroot/userfiles/files/33103710910.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/sikem.pdf
    • http://dezis.ru/uploads/files/79404337922.pdf
    • https://xuanhongkhang.com/upload/files/17895967962.pdf
    • http://kammerchor-lindau.com/file/20268329683.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/jesatelegiratibufipe.pdf
    • https://norservis.info/files/files/benazoxeve.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/majip.pdf
    • http://luberoff.com/userfiles/file/revujuwupufetazavujadew.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/abhb4hmg751tfckjr0ptvi6qbp/45082783623.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161408263b4b2d---fusur.pdf
    • https://tomas-music.com/contents/files/80283050882.pdf
    • http://kassa.pl/userfiles/file/movexox.pdf
    • http://calisnt.com/uploads/files/widegarevezululux.pdf
    • http://sun-apartments.pl/data/pages/31523487958.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/65674817058.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d649.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 16792 bytes
font_01_sfnt_off0000ee5b.bin
3e76e7721b517286357e6a6c05ec1af915978d8e5558e5670f2721f28ad5eae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 18564 bytes
font_02_sfnt_off00011ee0.bin
27db597cb17f0414a2c56fec51a3c71449345df1a90a6a60dd155bd924ac3eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 10860 bytes

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