Malicious PDF — malware analysis report

Static analysis result for SHA-256 2578c37c75cc57d2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 18:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6f79022978db36ed0286c513d168741 SHA-1: 6f8fda882a12832d32cc1119181ea2d27c530059 SHA-256: 2578c37c75cc57d20a65af585c6df9e220934607c534c2dcd5c789a890268eee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=iron+man+game+mod+apk PDF link annotation
    • https://lyubomiradineva.com/files/file/femimet.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/32852644114.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/farupuresaleruwasubon.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/pivedekeniw.pdfIn PDF document text
    • https://cubic.is/userfiles/file/5206672642.pdfIn PDF document text
    • http://nemalipics.com/faluzadi.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/navuguse.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/23389537199.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/93686144685.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/pekagivelom.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/guzevowiliweveziwe.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/tizutetelanixilutefa.pdfIn PDF document text
    • https://mavibusiness.it/file/romusumegalunivu.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/banepunibomedasusigep.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/kemenuxafilenikadomawu.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/90699801182.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/34598370001.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35623b11f---93155323434.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/24684579465.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/gumopagikoxowalof.pdfIn PDF document text
    • http://samtle.net/ckupload/files/wobatalularazijuwumasiku.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/66476417495.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/39177642047.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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 10372 bytes
SHA-256: 5038ed03ff324f80706246a65e2375283311586b4e5a7c9cf86dc77c43f09047
font_01_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 18032 bytes
SHA-256: 8d33b8d1368f6f3b0912cf3e60dac47706082d5c44e3c52b0e7b97227cb97589
font_02_sfnt_off000132b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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