Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4ff4d84f302c4f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 06:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c423ec1c1e4e84ab0d40548b0f5c85c0 SHA-1: bec4dc23fd26f5352f27a3d9ad05546db6a9f5ec SHA-256: 8b4ff4d84f302c4f916e801288c74bfc78f1dda0cc88ce684f4991832cc48d1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dogathermalhotel.com/resimler/files/60492214398.pdf In PDF document text
    • https://dobre-akce.cz/media/files/file/82597148804.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/lavonaponumowetobow.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/juzaw.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tatoxevefoxijomad.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332c2ccb38---72794944733.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/80914484897.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161309d1a72d32---walesuzukadulakojesilu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/kawodususupa.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/dimuna.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/77242902765.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/jobanurusunuxi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/kawekager.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/66909317642.pdfIn PDF document text
    • http://gr-chem.com/upload/files/76801716690.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109071749201284.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bijofegutomaten.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/bipezumunifuzaga.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/49940565216.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/xijademurid.pdfIn PDF document text
    • https://seerupit.dk/assens/file/gogal.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/53552295120.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/veponepik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+unknown+life+of+jesus+christ+pdf+free+downloadPDF 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_off0000b9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E3 11088 bytes
SHA-256: 9d1e397a9fd0ad7a53cacf0c2db16d254becb2f042577fc69a3de256e3c509d4
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 16584 bytes
SHA-256: 2b32122ff3565d549ebfa86eb82a552b0fe11c0ad551baf45d539eac930757a3

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