Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf515e525bbf1ded…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 12:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2684d2282a293072b23894b26c27caa SHA-1: b1f36c6f80663b036b5cda48abc2739d971d4809 SHA-256: bf515e525bbf1ded1979c9d79712e8816b59ead4fe6084c7b7c5c73fe6ecc5e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. The numerous external links, many pointing to potentially compromised or malicious domains, further support the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://findmealocalpainter.com/insurazon/admin/userfiles/file/pudotutawebuluxus.pdf In PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/68419701854.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/wifewuwuworilo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g22vm94mhasd2gnph9m91mi5s7/titakamafemevedixi.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/21641777139.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/revud.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/17953575213.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/xetisalufunotenep.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/67724412195.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fanedosodisi.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/bejep.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/jobarimobanexalixepoxa.pdfIn PDF document text
    • http://fluorescent-training.com/file/10197798979.pdfIn PDF document text
    • http://thevalleytrader.com/files/80229734088.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gukakivekirupunufegosinod.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/nivuzunukezejus.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/siwak.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3043ca81---29900611966.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/zusepos.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mobewuworadapetoro.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/51879620288.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/lugedoxetubele.pdfIn PDF document text
    • http://atrsara.ir/resource/files/lafijasujiwiludojumezew.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/55632300092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kenmore+stove+790+manualPDF 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_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 10672 bytes
SHA-256: d528aa1f92f94fb342b0e604fc24b9184ba65fac0add0840bd705a77b0ab3e4e
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 17132 bytes
SHA-256: 3717747cf0a89f58fc33b2b6839392903ddef5f8c9cda6fc94ea439761149071
font_02_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1