Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4c4f77d3815a27…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 19:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 1b33282b763d165bcd059793acd3702a SHA-1: 7021afa62f3e286528649eb82eae0e5f1330bca4 SHA-256: 6c4c4f77d3815a27c6043df42ba3d244bc9b796c61ec9a2d2c3b12c42341b3e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nhasachconggiao.com/luutru/files/80905344230.pdf In PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/sakunelasonototukuvajikeg.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/fujilevebitimuxoxerera.pdfIn PDF document text
    • http://skolky.info/foto/images/file/73697784687.pdfIn PDF document text
    • http://elskenecologie.nl/files/zixerifopuwaxudotaji.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/36655444901.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/fidinewufov.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/61560268123.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/12548032270.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/pifegizatikeziridowanavep.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/74521687586.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/romiribi.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/pojenasuluderefelojaminem.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mosilimunotuwewedu.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/valapixexilirejojus.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/32619849523.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/120511664ae45549067ac1c72e42fdff/busavusotoniduvizetojin.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xobumujunewigatumax.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/24060326044.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/14917943815.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/45784904320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kindle+app+for+android+reviewPDF 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_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 17180 bytes
SHA-256: 3dcd15bff8d213725c1a0147fdcca8bffe55b435fa0e427b1c053e87d5a33f0d
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 10368 bytes
SHA-256: 11f73c66247232c7f1cce0b77b5747433ab0eb7ca8fff480fb20b3af9c0a6240

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