Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf162a51ae62c18e…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d8e72cca8356147e33821087c45d46d SHA-1: ecadd7eef73cd9bd808f3ad0e53cfe4d722c8291 SHA-256: bf162a51ae62c18e700deac71a659dfc53e600a1e762c746a68222ff343ab152
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan detection. It employs an image-only lure, typical of phishing, to entice users to click on embedded links. The document contains embedded JavaScript, which is likely used to facilitate the redirection to malicious URLs or potentially download further payloads, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://archism.ru/uplcv?utm_term=arabic+dotted+letter+tracing+font+free+download PDF link annotation
    • http://zhengfutz.com/v15/Upload/file/202192974514862.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/69963581331.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/57893250216.pdfIn PDF document text
    • http://nktrading.qa/file/files/sowedorobavanutevawufebe.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/jovitafaka.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/fulanomegofo.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/59122835393.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/lamabupikivumuwu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/25157689577.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/47528045436.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/vidagovuguwaduv.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/xogomolib.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/18835817218.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/bidobekare.pdfIn PDF document text
    • https://aitalk.vn/upload/files/61705197483.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71181313506.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a347b3f52---31292720742.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/55500560758.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vumatekawabexo.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/mijaris.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/34643037361.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/nosinonixup.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/vufuwatis.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/6014169552.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/65832188600.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/nunorir.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_off0000b2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EF 14244 bytes
SHA-256: b5b4bf9b9c42dbc4cddfc9b9b15ad2c705a3b6ec6bc2d604d42666c041c1fcc5
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 10688 bytes
SHA-256: 6f2c603d84cc5a977532ed02e8819fd868becc4631199cd7d4b6f77a8939a9cd