Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16fbc7abd813c21…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 11:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e7777cd60673a36e08c739f309b3a83 SHA-1: 7eac9e0161b01131194e720c4004027e48bcac7d SHA-256: b16fbc7abd813c21b98478b5c13f18759507330e1365edfc5179b378b19e26b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902051918121297.pdf In PDF document text
    • http://kahsport.cz/userfiles/file/53503816141.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/44446090764.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/15578526032.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/22909777760.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/79317568232.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/52731158517.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/38309698410.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/sodabow.pdfIn PDF document text
    • https://invision.buzyhub.com/files/54237006951.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/39696933938.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/bibisomavu.pdfIn PDF document text
    • http://www.toptehnik.si/images/tenomazanawoxaper.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ade0405fb---97060541051.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/72756382288.pdfIn PDF document text
    • http://labotinnghia.com/img/files/92263244565.pdfIn PDF document text
    • https://ptogel1.com/contents/files/49212911805.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pagaruwimigumofobe.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jozodutotebanuxagujone.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xagivotakaw.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/gusanitekokate.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/7319964683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=porque+se+activa+solo+el+wifi+de+mi+celular+androidPDF 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_off0000bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 18564 bytes
SHA-256: ad773a19b288a331cbaa88d3dcf91739c39b396dc0a95fa5c8d6439cca8886d5
font_02_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 11036 bytes
SHA-256: df0dd155e67d7fadb7cc481f4bb246b541ea2b888b6ee4309c3e9672ac9f7f3a

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