Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5458ba8af35fc3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 19:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b788e052f10071bdf9cc85157bc95f2a SHA-1: 2304617a7dad7c3da60ca6dae3863af613f0f415 SHA-256: 2c5458ba8af35fc3787f32bef21cfd425c2b6056b66966bbad0fb672f15d1e4f
166 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it employs a social engineering lure to prompt the user to install a browser extension or update. This is a common tactic for credential theft or malware installation. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect the user to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://obkladlazby.cz/userfiles/file/loxurorevugolokixarixis.pdf In PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/78477088781.pdfIn PDF document text
    • https://ags-car.com/upload/files/bapipebukewelapuligofoz.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/judugofezovufe.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/35170234751.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/wufevozumewizoxukide.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/57185638938.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/47636580551.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/wibawimu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/22893410917.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/45949410145.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wepokutusudugeluxaroxobiw.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210902060652.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/91258054077.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/87616008251.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4826ce90---tiwujurakazuzorobeki.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/buwajigitimanared.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/59070641946.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/77760848510.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/jiwozukazilotez.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/sagisumaxeba.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31671210884.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/93142876090.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/botpd7foueo2fu760gu2l7fse7/zumizawotuxevofitaduwag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=indian+local+train+simulator+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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 10684 bytes
SHA-256: 624196e43619628fab34b7af4e047ccfc8a5e31432524380a56e68512201af9d
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 19844 bytes
SHA-256: 5078863d757e51bf7896d10ea0b39fa947c19120f8177ef4cebaec4e1d31df06
font_02_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1