Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b3f566a66a21ae…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 05:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5456f6260ac35c2cc76e96c7a0b3135d SHA-1: f5305050a7dcd73945252a597cbc6d0b19c324b0 SHA-256: f4b3f566a66a21ae2d0c7510f08878545fa5ace0bad67e4f29ccdf93f7cf2890
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains. The presence of numerous unknown URLs suggests a phishing or scam attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://hidropro.hu/upload/37371706317.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/zuwipuxiserifowasofis.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/xivusajofulolor.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/22861949919.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/lafujapitofi.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/39674234291.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/jatubomefoxedolar.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/94294625848.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///63352327867.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/82715588474.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/39695799894.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/sizanasejoresudujujevoge.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1958406006.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/lesasudajekugeroju.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda22a0fc4---94260337415.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/74764961514.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/tutixiwunuwud.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xetagenizuroru.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/75580731129.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/kerukover.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109111927467761.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/warenizoposaw.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/7790684229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+add+holidays+to+my+android+calendarPDF 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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 17608 bytes
SHA-256: 3b98cc100d6d62c8b04818f578de2ddaf10dd77da71d52fd431b9a28a8baefc6
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 10828 bytes
SHA-256: be94986757b618445fab5bd412e8f4c85312c014a718638fee1882eb50ea3fcd

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