Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc42a7b5f6bd13f…

MALICIOUS

PDF

83.2 KB Created: 2021-10-10 00:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 07f791167b003813b1e48f448d9570d7 SHA-1: 3e4a7ca09019893195b63a1248053c363ae6bc96 SHA-256: fcc42a7b5f6bd13f02ddbce044a3c95f84cf57621f12ae4ef380837d6b87f507
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for phishing and malware delivery. The presence of numerous external URIs, many of which are on disposable hosting and use UTM parameters, strongly suggests a link farm or phishing campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://huntic.ru/uplcv?utm_term=dnd+character+sheet+download+pdf PDF link annotation
    • http://docando.es/js/ckfinder/userfiles/files/nitomepazupenuliterudoj.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109241131160870087oejt3.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/17153689096.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/19909960564.pdfIn PDF document text
    • https://thaodienland.com/fckeditor/editor/filemanager/connectors/php/temp/file/zaxarar.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/rabumaxisa.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/senuwepurane.pdfIn PDF document text
    • http://bienbao.net/uploads/files/38646041668.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/41105044213.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/44584616566.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210917_202048.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nedisupakapefatox.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/pulolosamusisabi.pdfIn PDF document text
    • http://poiskvod.ru/images/file/86996470021.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/romode.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/74050126926.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/47035251887.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/58245099792.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/9210468930.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/bagimix.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/pegewuzilekivopu.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/tisupo.pdfIn PDF document text
    • http://hzqzg.com/d/files/zekut.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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 17728 bytes
SHA-256: a7e215441606efd4f700f476bc5235d8850b29d4b3eaf05301ee4f617b133a1b
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 10712 bytes
SHA-256: e60fc9f1a7e033fb391d51cd6e07a8f8df0c86851aca38ef0c878a80135d68c0
font_02_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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