Malicious PDF — malware analysis report

Static analysis result for SHA-256 78636dbe9ab4eaae…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 05:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2f84323727fb359f5fe64a8da1ba734 SHA-1: c3b67039c89ee9c46802742de51fa7bfa9744928 SHA-256: 78636dbe9ab4eaaee56d06efd9b94584b32970288e61fc57e2e500072a489cfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically identified as a redirector with a 'utm_term' parameter, suggesting a phishing or spam campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URIs and the nature of the URLs indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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 https://philabc.ru/uplcv?utm_term=thoptv+latest+download PDF link annotation
    • http://bowlingkillers.com/imgdb/files/timeguvepugeto.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zalalakikitafivemeg.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/85674883918.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/libilagasepokijexev.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/19133024343.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4fis3rkeg7bo9qad35f4upod2q/84658857555.pdfIn PDF document text
    • http://insei.eu/userfiles/files/nomimevozekigimod.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/21393801964.pdfIn PDF document text
    • http://prota.ru/upload/files/77229207470.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/50986852270.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/komulodadidulowepovep.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/difiwixudukav.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fatuwaju.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/fagudijoxesulo.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/92917627184.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907234343.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/34670984657.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/74322126254.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/93627035047.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/tomebiwul.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c76cd7233---lebonaxiputamogoto.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/70794219307.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/12085387004.pdfIn PDF document text
    • http://flexa.cz/docs/file/57715782645.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/64187205438.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/kedofiz.pdfIn PDF document text
    • 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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 17472 bytes
SHA-256: dc5f18c77471543465d4dab06e623b808ce17081dcc52b43c8585264d45e1b42
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 10412 bytes
SHA-256: cfdb216027edf1434d73816211f09173c5ca92f6adf64e898e200fbd8f6148c1
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1