Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6c777eddcf0e97…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 10:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d89b098ecee565812bc3e42f0491bd8 SHA-1: 9e0a38c4ed349726eab8275dd95aecf8dae21bc0 SHA-256: ac6c777eddcf0e97fb8b31031239b155248dca914ac5e5ddd636a9e20ef13278
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with a spearphishing attachment attack vector.

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://archism.ru/uplcv?utm_term=how+do+you+transfer+pictures+from+phone+to+sd+card PDF link annotation
    • https://apz-arte.com/ckfinder/userfiles/files/xejogisoxu.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/gupolemiwiduporile.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/98589844658.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/85378295323.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/43527677941.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/wexurasirajog.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_1904ED83DCDE1B6E.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/fofaripewivugepafovusaz.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/17437363929.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136466943ed9---kesituwotabatemuji.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/80710847831.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/nenilogixevevolemaxigab.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/38784000783.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/tabakitewimivizit.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/986ab43901e91ffa1948c5a44713338f/62679809910.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/tixalajimonowodatogobu.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/sijekixifal.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/6711860041.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nusixifogefofugaz.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/nufaviketironejavebok.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/muwoj.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/fudobepamipajep.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/70151462100.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/92945348430.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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 11132 bytes
SHA-256: 0bff6a3e8a56fdb9bcb968666d3c2e9c31026f48fef89504ec11155e7434269f
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 17280 bytes
SHA-256: b22b6c62285ce094dd2054f020eebdf3c8de76769293a18d70e4fc5d81a58939
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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