Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57c343bb13fba97…

MALICIOUS

PDF

89.5 KB Created: 2021-09-23 02:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40523f5dfeaa60e97f346353f9d73688 SHA-1: 1bc8f4b454a9d0b9fe2c6bfd65cfe05ce0e110de SHA-256: c57c343bb13fba978ddf00ba3e13cf3530089ced1f0040c3af03970108421713
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards the document's primary function being to redirect users to malicious sites, likely for further exploitation.

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 https://krisoc.ru/uplcv?utm_term=android+studio+hello+world+kotlin PDF link annotation
    • http://webinaris.org/ckfinder/userfiles/publics/files/61410984948.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/32201601962.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/28750706901.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/72399221061.pdfIn PDF document text
    • https://etadelloro.it/images/file/zawegolanedawogofaxawowe.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387d0185aaa---karig.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/lixezakuko.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/mowob.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/zuredososos.pdfIn PDF document text
    • http://12shio5.com/contents/files/vanuwatoxigebitosobuloru.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/wemizuleguxukomibawakabo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2c37b07d---57501170661.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gaxekerigijurarifubakofeg.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/kakeperawunapesubuzuwej.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/67077397517.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/12786448460.pdfIn PDF document text
    • http://chengzechem.com/upload/files/84731516170.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/satawamow.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/fegukitogujubisarowoxibuv.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/22759077592.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/gojuminukute.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_011724_181.pdfIn PDF document text
    • http://dasbluemchen.com/pazatewe.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_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 17808 bytes
SHA-256: 9f52d89f55a33503efd7ab14f81a23999c4364813231a31b20e8379d69cb898a
font_02_sfnt_off00014055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 10444 bytes
SHA-256: b53d3a3d8c2f15fe9a500dff7e20eed595969190bc5f035e5d3d4263aff1dd62

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