Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cec8531e93694be…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 17:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 152ffb4c61b0ea1d3f68cd99990da823 SHA-1: abdaad6cc0ad8dc991f7ca5ce0196e1024e465d0 SHA-256: 2cec8531e93694be1b48daeeb06c3c3d4c1b59c5e2a809201c952659733a6fec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous external URLs, many with UTM parameters, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://huntic.ru/uplcv?utm_term=free+gems+on+stick+war+legacy PDF link annotation
    • http://www.romanschatztruhe.de/img/files/kodafa.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/vosotivisejavegorurix.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/esoliku.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fugikovu.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/kitek.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/bixetameguverize.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/jujefukupur.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rilogazabezazaf.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/89852222203.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/51785543741.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109111453045466.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/goxusidiziwisifugol.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tuvowow.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131556d88f64---62424240096.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109131158307375.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6faec92e2---6587190622.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/kokitijefajudagesojogike.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210915161053.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/vuvizekolotugokusobuban.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/12922611555.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/70659929360.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/87914602347.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jerate.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 10844 bytes
SHA-256: 1945711602d0d463cca010c6e9a0b38c42168de0984ea03ef0264b99c3dc6506
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 20492 bytes
SHA-256: c168fca2d869849317a79b50c1509ce54fe4f6c6ce5279b67a50a780c53e4a0b
font_03_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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