Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49ddfbb991cff7f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 14:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: b3b0b2c6a4ebee04e032ddde60bcee78 SHA-1: d8d388d7ef44efc345136b29067b28c669680386 SHA-256: c49ddfbb991cff7ffbc196deeecf3ff3a38a3d87297d27bc13c642a0999213bf
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous distinct hosts pointing to PDF files, suggesting an attempt to obscure the ultimate destination or distribute payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4151

Heuristics 6

  • 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://imhang.com/fckeditor/userfiles/image/69385175061.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1933f2e07---83471724114.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sikuwu.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/20176355732.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/48058515358.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/nabadofubibe.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/22541310629.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/bividusej.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/mepubifunizusuxopaluta.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/15636348200.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/xebufexejufitoxuvafa.pdfIn PDF document text
    • https://vpmemorial.net/images/file/72128049784.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210914043615.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/rasajajozeredisezav.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/felade.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/32943586135.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/zafedi.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/vezisugapasebogodoseru.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/gojelitizu.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210913001705.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/solotikubatezalofunumud.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/sogapopir.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a7ba4302---nigoxivaxinoguge.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/22688076067.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/pomuribuk.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/24372458522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+built+in+dictionaryPDF link annotation
    • 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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 10396 bytes
SHA-256: ed7001f0b3700521ddc773321008afb8304f8d0082cb5300c148cd873a0f34ff
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 17868 bytes
SHA-256: 3ea205ef0236d35d4364166d54c8f434f54748a98bf63dbbf602f7d0a6678a26

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