Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a57d2657badee9c…

MALICIOUS

PDF

66.5 KB Created: 2021-09-24 22:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aaa8bbc6a4836e2774e115899072f24a SHA-1: 8f656d626d4d6f8ac0b137b0514f79ac803f3662 SHA-256: 8a57d2657badee9ca0d5465dd2dd20b9bddf535f4285ada79dac92e0523dd47c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests it's designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

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.
  • 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
  • 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://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/jiforudurenovatawipap.pdf In PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47443996448.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/zusenegodinigizixo.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/bewegukenizejepezivewed.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/69189973687.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/69434163325.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/3018855885.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/mejagimutunadewozipimazal.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/68633343351.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/5256888845.pdfIn PDF document text
    • https://finliz.lt/i/File/24611835592.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/55730056411.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/20932803180.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/jowalemasevojas.pdfIn PDF document text
    • http://jsdarvin.com/files/87262148656.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/61070904464.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vopuxomuxekulit.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/zedosevulagofewovosaga.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/11592955113.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/50463537330.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/63574061917.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nalijomepoto.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/ratadejofozuzogidanabew.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc50878246---74023079972.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144b93105a48---mewuviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fast+and+furious+7+123moviesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 16368 bytes
SHA-256: d2b9b0c01a428b114e26cc929523a2bf3a378965a657b2cd77904f815f87f98d
font_01_sfnt_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 11008 bytes
SHA-256: a62a906684a052cb8faa9919b12643e884e37af1a198ae6fa030ddc9d873ef44

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