Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eff3d71a8f512ed…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 22:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f813ccc0c4b200c974d2df897036a81 SHA-1: b176a95b44ed50b21c306be0d3b9937d9ceba3cd SHA-256: 6eff3d71a8f512ede2150f1566f31cea4cfee55e8c3e152281f5fc643817cf25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12684151429.pdf In PDF document text
    • http://digilit.ir/basefile/digilitir/files/kawivobakotijunarisakow.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/rewiw.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/63360400050.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/38590974135.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/3313710303.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/26996993365.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/xuruxidele.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/lugaditup.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/98858213126.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30319369047.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/lavolapozosadajofub.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/74438835230.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/siverefud.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/92622596897.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nuxajodepizog.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614163d79b5b7---razerekamegofado.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/jejexekulo.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/13093560325.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/asokafkkkl9va54cu7105tcvr6/40934598495.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/lelagiz.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/joboxukozep.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/vegasefupumisuwe.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/vavemepeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=my+hero+academia+to+watchPDF 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_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10508 bytes
SHA-256: 24303493a0a8d0f064d26479e2224423d8164643763483c2397576edea173fd8
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 17932 bytes
SHA-256: b70ab1eb71608ed7e44355f7279fd625410e8b88d31ebf93dfba5341f9192094

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