Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2ba3a75476ff3e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 12:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfba9a4ca6978bf86148eff786296587 SHA-1: c37b6b3567a07bc8ca1e3d5c80cc6aa90ad9cefa SHA-256: ec2ba3a75476ff3ec4c84c35d174355226cab71764b5629ba23f3d1047f786c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a disposable hosting strategy to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=how+to+hack+someones+yubo+account PDF link annotation
    • https://www.domosystem.gr/ckfinder/userfiles/files/74105748381.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/53468462245.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/40411287568.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/tukelutonajafafupopape.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/jumotupolesabonuzup.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/25261913934.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8248d7b0982def87352aa4c9ddd09737/41529859061.pdfIn PDF document text
    • https://limsurdua.com/contents/files/zokin.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/zosisezexitaruti.pdfIn PDF document text
    • http://svx.su/ffile/file/sefuvoxavujutuxud.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/jefebavisoziba.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fuxitagewipilagotigusoxux.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/mawej.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/bemesujakigoga.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/xawufix.pdfIn PDF document text
    • https://banghenails.com/upload/file/mewizuwoxeziwalav.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/xejisujeromorovidi.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/dasozutewut.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/boxijidubojuwawoka.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/jewugukiz.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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10780 bytes
SHA-256: 6c6b3eb4e5d8637391cddaf1232440327c1d533ea7564b06c81c1bc4c31703bd
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 19408 bytes
SHA-256: 0bf8cb5182bc2d71a591b5fae05f06386077137b25b67cfe8bf4918bda1aec52
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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