Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c61add0257c5b7…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 14:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a2ed0471587b5de9693171e407bd868 SHA-1: 5c870476acf3dc39930188a299cedb6e0aa9bbee SHA-256: 36c61add0257c5b764cd04fca5352fb17e56d58cac2d3329ed01a7975d97997a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external content, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://cubic.is/userfiles/file/kukutiwe.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/24ff58946574450c4c01281bd6aa6c17/bevekuvuziwiromulosupabej.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/59271447858.pdfIn PDF document text
    • http://ndt-ultratech.com/files/11295431628.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/danudojifadenofu.pdfIn PDF document text
    • https://lasanisports.com/files/lavigalak.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff66834561---mowakenepebipapibe.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/71280714593.pdfIn PDF document text
    • https://33mobility.net/uploads/files/99990886526.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/88111867339.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/laliwomixuteroravovepuw.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/jetubup.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/56165251563.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/veroxajogopokeraramam.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zuzewuletunogi.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/temetakavuziremasexe.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/47650465255.pdfIn PDF document text
    • http://tano-cable.com/d/files/famekosaxapemutod.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/27999842968.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/96895131815.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021918550455855.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/95418620420.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/58520015626.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/62975268521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=stickman+1234+playerPDF 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_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 10948 bytes
SHA-256: 38a0f904d9cb59cdc74644dcc69f6dc98a0f2bf32d30a525663a783e11ffff59
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17300 bytes
SHA-256: 022091432ff15306dba732a555448f49ddf3893ed1573c29c10ad324618c0586