Malicious PDF — malware analysis report

Static analysis result for SHA-256 646578ffd13aef38…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 18:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eb39cf5bdf2629e1c71110ea017593d9 SHA-1: 7b77cf94490c2aef3b0ca047ea86cb7482439150 SHA-256: 646578ffd13aef388b1be075969d67112a77f33648c7238d960f9812d5a57b2f
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 embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the PDF is designed to redirect users to potentially harmful content.

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://dacinsara.ro/fckfiles/file/72073760355.pdf In PDF document text
    • https://buyafranchise.org/files/files/xerekixikawa.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/solawasero.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/zusamoxeluxamafova.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/dezof.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/37860788661.pdfIn PDF document text
    • http://edallyshop.com/upload/files/dugubuvovefogiz.pdfIn PDF document text
    • https://kuepancong.com/contents/files/89683126430.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/46868656946.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144373357d53---zolodituvofajakesumavib.pdfIn PDF document text
    • https://medius.sk/userfiles/file/kikavinanegik.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/buzexutexitebegajajud.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/40244776001.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/25085995690.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/dimorigurop.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/59916290873.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/73186887833.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/05a12a3a01929ab6056b81e0ff015bfa/kowowizotiwalefogudadovek.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/zowamavibesijiwiduk.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/lixopuluzepemifiv.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/93261264233.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/1430253569.pdfIn PDF document text
    • https://okazionche.com/files/digelosuk.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/niranedoxajojimoxepivag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=autocad+2019+serial+number+and+product+key+activation+codePDF 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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 19680 bytes
SHA-256: a6186b7083c15ff95dc815bd7e04cd1aa4a22b0e96c5633bcb2f0f0deaaa0146
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 11628 bytes
SHA-256: d643a80e8ec71b5493698d40e61ecebb4851d7303bf59222d3567fe581195aec
font_02_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1