Malicious PDF — malware analysis report

Static analysis result for SHA-256 c741cc149952fa11…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 01:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5301066f07ca80602f0cef38f1367ede SHA-1: f839ba2aee73d9769758355628024503ecabe6c3 SHA-256: c741cc149952fa11512877b271031a075de8db702ec761d6f0e6739f50396d4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The presence of numerous external URIs, many pointing to potentially disposable domains and exhibiting link farm characteristics, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://carrozzeriabosini.net/userfiles/files/80135659859.pdf In PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/32986475143.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/zitipemezumineguposa.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/badavirofet.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf9d6bf80---95343327403.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/gotexopepenopazudaxete.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/bawobagupuzigukipidagode.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xudeluloxit.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631884811.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/vepona.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/zasirepizivaxaluxegadeben.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/162257022422.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/xixilaserovipeminulixikuf.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630495316.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/86947338946.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/38709445216.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/29492811793.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613495d2d380a---23282858493.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/dojijewerupimenariba.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/40872018577.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gujesufinajogovuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+family+farm+seaside+mod+apkPDF 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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 10856 bytes
SHA-256: 18fb410da0421b40ff45be64f07645ce6fcb6ed4345ff41c4996f841494e6c2c
font_02_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 19080 bytes
SHA-256: 5991c500450cef62c25716e40ee24c967265b6135fc2a12ecc88ee7dfaff0973

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