Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aefbdba9a50aa2e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 09:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2447b4320280c25c57c229aa485616d3 SHA-1: 77e474e05f48e1663c8a4e2541b1adf2547a284f SHA-256: 2aefbdba9a50aa2e4a60b002fe708754c8e3bc91b849db49ace4c05e632fb8a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or link-farming scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=on+fear+krishnamurti+pdf PDF link annotation
    • http://malovanesklomh.cz/images/file/vejidevunetimoje.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/70141543584.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/navategesokunanikos.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/38686845486.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/faruwesuvazewufawumodinuv.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/57347997986.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/buguxegatog.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/49658645862.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/mowekifo.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jozuxitozobukate.pdfIn PDF document text
    • http://goref.ru/files/file/98126009486.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/nanisipelukureku.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/wudutipulisozerupase.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/nabixukemurog.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/wotaxu.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/pupowizazifiro.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/23762468022.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/12175398425.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/20438467229.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/rokukuleraxajiden.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/86860759717.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/56935754261.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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10812 bytes
SHA-256: 9d4c5a3524576f24b91e7ffafab9b903fea8f4c2ea1139ea8687d29e22c77310
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 17064 bytes
SHA-256: 90dd72877d7d175b42ff472a70b71856cfe5c4ac685068584c3949188b96b026

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