Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e51016d293b98b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 12:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7eeba05577c64f9e8430d791d13d8fee SHA-1: 3645b5ca94a036f241c016ca152deb6dc1707627 SHA-256: 49e51016d293b98b91818b79d64bf296fe389a64283b9efaff6c491f74f50df8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware delivery vehicle. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to other PDFs hosted on disposable domains, suggesting a coordinated effort to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://limpiezasinasel.com/userfiles/files/govitewogorixavenatowozew.pdf In PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/71710408914.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/tawogemevolokedibixodata.pdfIn PDF document text
    • https://themalc.org/files/file/xorapejejulugagadoda.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/96217551904.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ginibumej.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/99280107244.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/xakenato.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/36487368493.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/19743643229.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/nofizinugukugizogabuv.pdfIn PDF document text
    • http://grotech.in/userfiles/file/45441219258.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/taror.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wuzusoworexalo.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/vibanetosoromagoruxepev.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/vupujukovodu.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/14823485751.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/mevupibubafavokewajoni.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/tefavexevigufitaxex.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/mekufoselajemo.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/15242229331.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/32646384070.pdfIn PDF document text
    • http://getvisa.ru/images/File/zeraxib.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/gukusivifapifu.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/30451097487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=game+soccer+manager+2021PDF 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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 17012 bytes
SHA-256: 6c3bd3c94824d62a22849e3fdd25de823fc02bf1580b43ead18f13d0b83877a3
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10668 bytes
SHA-256: 3e0926fc0485a0f1a21c88c5a1baa12068da275a9a126eb30ea335e53756ad2a
font_02_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1