Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef4b8a1faab65f3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 10:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 87b4e9d0b442ce1df25fc27750c7e773 SHA-1: 72559f06d72e20512e6ec3203cb87bcc8d7544a5 SHA-256: 5ef4b8a1faab65f334bcf43b50be75c0f13407d076cb12cca01b4a8d4f02df30
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 0.9971

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 http://musicpark-live.com/userfiles/file/vemidovokisediwipuged.pdf In PDF document text
    • http://avanti.pl/userfiles/file/55266637954.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/papogalozuxaguzijo.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/fexeminabelifanubi.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/97534492023.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/13566363948.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wobuvilasopefadezif.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/sefereranezudagipanogefu.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/38910144929.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/96802873983.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/18686471056.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimezabisomes.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/pamopajilul.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/dubabu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/piwojelafoxurosijub.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/bufozuvuzareridutujax.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/julof.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/gudusakominup.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/4885936379.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/gobugajuzivapomuvegiz.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/55705497025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=turbo+driving+racing+3d+mod+apk+hackPDF 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_off0000bb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB44 11048 bytes
SHA-256: 14c83740e32fce572a49a47e894e11314b370a3b4dc7406271548d215eea6312
font_01_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 17336 bytes
SHA-256: 9d2031faa9c085518d63f85936c236c26ed6a1e3157a0d78fec6ce64095e06cb

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