Malicious PDF — malware analysis report

Static analysis result for SHA-256 136f59da63f752e4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 14:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 827503c52c4052e236b8c0d0b07de46e SHA-1: 4a87c736eeee65411ec4c646bec688a3ec6dfeb8 SHA-256: 136f59da63f752e421a980d253b37bc320cd054f85cae8ed01bf10e9f58d8efd
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 0.9975

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://synerhu.ru/uplcv?utm_term=gangstar+vegas+game+free+download PDF link annotation
    • https://upbfassadenbau.com/upload/file/linifawumoxezifenopitako.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/sozidokuwedotabegejapewuw.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/85975358201.pdfIn PDF document text
    • http://art-ball.net/files/file/75806438004.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/kebiwuxudinubowazitadofix.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/wunoninakagezazu.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/25511761278.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/81890220875.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/vurunexebujigileb.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/gupufixodapudoxoboguz.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/67998950260.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mabezit.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/40072897294.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/xojizejego.pdfIn PDF document text
    • https://kawanmto.org/contents/files/95320765437.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109040054112930.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/76501081224.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/89831802845.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091010161750.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/39249875234.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/luniwodiranewesufapom.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/76358530097.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/79328408277.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/misilejiradixoxikar.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/55479103127.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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 10796 bytes
SHA-256: e0b3c668893bb3b7342482a7ea33a4ff346ee61d97355aeb7d7072f1a3fc279f
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 17480 bytes
SHA-256: 94de136e8def16b5caf4100aff046f47e8658a1a2168550dad48784ab2e346d2
font_02_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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