Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecae04c610bbc62a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 21:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df5368d3c93dec272875b6ef4bd9ee9f SHA-1: 9d50033ed0e73acea47ead57f42d18eca9a00af8 SHA-256: ecae04c610bbc62a6b3c7ae0d953bb74ae002b485e46c0cba468ee650d390408
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are linked to link farm heuristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a common attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=free+games+without+data PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/2124682318.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/5630356984.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210919001707.pdfIn PDF document text
    • https://strechybenesov.cz/content/gaxaxodixak.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915074200502688moghnie666y2.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/43849709828.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/75778203586.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d32edeb1f---kakulejanilamomodenulegur.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/kemawodarus.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/99163207325.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/47222775816.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/60559854556.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/74796410513.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/lafexonoxitewe.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/34239187201.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/24669556432.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/42207239272.pdfIn PDF document text
    • http://qwerty.pl/_data/file/77328962454.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/14376870669.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/finisuzasal.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/siwuro.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/49357100993.pdfIn PDF document text
    • https://phuquiland.com/upload/files/zutajaxipudukinumu.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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 10708 bytes
SHA-256: 8741fa778de1cc93d45381f4dc74db7fb2f2ba5dc5e070cc5736a6002e24664a
font_01_sfnt_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 15528 bytes
SHA-256: b889e52855a760a3bdc7265d502c719f0b6af65ce5b5fe133b9c228dc902a59c

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