Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3c49a9ba782078…

MALICIOUS

PDF

69.2 KB Created: 2021-09-08 18:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7a6d499187fb4b1b5dbfcc4c31081b92 SHA-1: 8dc5997e1afd52a1b62c75c691361257c4cfdefc SHA-256: 2a3c49a9ba78207865ef0e3dbdf94e6d8dd5de3d760ddc0600afbbe840947be0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://ippinnudon.com/uploads/files/tebitipere.pdf In PDF document text
    • http://madmojo.com/fckupload/file/vodaxegubonuzako.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tufaweruri.pdfIn PDF document text
    • http://wjcopy.com/upload/files/nanixitiraxi.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/potorekenonak.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137670f1b01f---11852941873.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/67849622239.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lidibidukekevivofu.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/likujizonobusamoxuzikugoz.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/bubagevitugiki.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/64503442166.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/17286493842.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/53156030511.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/96496187317.pdfIn PDF document text
    • https://southafricapools.com/contents/files/13107971792.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/9017388487.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/80748868204.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/putofoxigatinaxo.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/balaxibidivonifeb.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/figuzaxorazetibogumevuli.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/3914257797.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd9020a2f---zozagipafavura.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/fuxurovoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spanish+alphabet+printable+worksheetsPDF 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_off0000b247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 10740 bytes
SHA-256: 916eb8dfee54e0052a3cb5412d2292674b0c447398d0a84df96e799fba7ddcd5
font_02_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 14436 bytes
SHA-256: ddae0623631d3d13d4748bdfd266ceb6c5f591f726d7f8ef6775c94f1106641a