Malicious PDF — malware analysis report

Static analysis result for SHA-256 13728416fe132e78…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 01:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 34ddcfb5124b6fd3b37aa2618b789a38 SHA-1: f46ed50e59360e4977658c2778d0d29aef894075 SHA-256: 13728416fe132e784fb794928ea5441e3dd54cb84f989587bea2ec6b7751cbd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://galluccifaibano.it/userfiles/file/naluxevemilonit.pdf In PDF document text
    • http://p-jtech.com/userData/board/file/buwuxesulajovitiv.pdfIn PDF document text
    • https://papiratisk.cz/soubory/59635976003.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161426165c0760---37021693771.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/kigavak.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zuzitukigoso.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/tobogeserazopapanujupi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25769057436.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/50633667056.pdfIn PDF document text
    • https://suksesunited.com/contents/files/84040257999.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/rubasakew.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/36638678537.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/3173139808.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/jaranivav.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9bc3f146---kefoxomoka.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6377e535fbb90ed327e3b79f4b9b77e2/30370644085.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/33442103563.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/dosolizukirigevubes.pdfIn PDF document text
    • http://twilaw.com/files/files/gamunogironimutoxefa.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/setotidipokowel.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/82379180460.pdfIn PDF document text
    • https://conrays.ru/f/data/xumavoxesenawinixowape.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/ximegufekujobenibelazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+delete+apps+from+a+firestickPDF 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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 17548 bytes
SHA-256: f6856b93aa16464263e23e120b40a2f586cad80ab2a36341562b73a80dfd3240
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10848 bytes
SHA-256: 543e65d6cb7e1877587fad255946bc36f8b56f9587d1147d7ed703ba8c4dc241

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