Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52b1c1a940972eb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 04:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 427239428af7053e115aa8cecd3ea914 SHA-1: 692c1d60736ef42fa01cdb24d466a330842f7d3c SHA-256: e52b1c1a940972eb466e9c0c43ce63fe3c621da7fcb32b6cbf55a1343cfb0749
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://urotunisia.com/uploads/FCK_files/file/9022083808.pdf In PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rovibuge.pdfIn PDF document text
    • https://durimawar.com/contents/files/sufawim.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/lifutemoreku.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/gomevuzazibetozobosor.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/56668719673.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/94785018787.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/94154704298.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/sopil.pdfIn PDF document text
    • http://inistor.com/ufiles/files/91919896181.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/77894719483.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/wukufovusak.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/rerezameles.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/wekuse.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vemekavaripoviwesiwaxamob.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/xutogatovuvigosumikolu.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/88364989420.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/koxuk.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/pivuwopuzeviref.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109080628581798.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4602abb8140e669cd277f21fb1e5055/99220428577.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/569886757.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb36841fa---dejaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apk+map+drone+ml+2020PDF 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 10508 bytes
SHA-256: 7273df58ffaed1ea8679d3e76661bf812314d1636df38de58866aabbca560535
font_01_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 18656 bytes
SHA-256: bbac00d8defe4adf7704119bcb6c56fb7396b34f16989dd5eb0e55d985fd2776
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1