Malicious PDF — malware analysis report

Static analysis result for SHA-256 2042ce79e7d7be15…

MALICIOUS

PDF

82.5 KB Created: 2021-10-10 06:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd2b746ac7b6fa70a2cef77231138907 SHA-1: a3bd4b31c2fecf4a2584c962a657a4202a0ce58c SHA-256: 2042ce79e7d7be1563fd06c29a93375090ba7e8eeb19e1b4a7ce449fa2609f3a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and numerous URLs suggest this PDF is part of a link farm designed to redirect users to malicious content, likely a phishing lure or a downloader for further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=icse+2018+maths+question+paper+solved+pdf PDF link annotation
    • http://dream-mebel.com/pic/file/vasamekubululakixo.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/puxotetawamonam.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631810076/file/simuvarominodebivuz.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/lemigatezasujatolisado.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/74623630857.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/vufibiwajonu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/90522982243.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/76116247139.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/timefobidaveful.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/nedosegubedun.pdfIn PDF document text
    • http://www.andreapondika.cz/file/relaganewebugupuduzefok.pdfIn PDF document text
    • http://lyshiying.com/d/files/94875046212.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/63580447171.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/mewekomabokenaleratugu.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/9029203634.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/28028316538.pdfIn PDF document text
    • https://lorus.rs/files/17819634771.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210921_26EA2A403DD88E8E.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/39247815521.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/fiwokabisag.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161524b57e2d12---xajipigisirugebope.pdfIn PDF document text
    • http://congtyvima.com/images/Download/xefek.pdfIn PDF document text
    • http://www.moulbaix.be/fck/file/zovijafekebajukirom.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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 18456 bytes
SHA-256: 8ad3fc929f2ec9c40e8ff1b2aae313ea3ca80ae11d35d03649f749f9d3a1a5ef
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 11648 bytes
SHA-256: 00bd720cad2506c6b470f903942791d112c4c331070f1e29a233b716af7d9bcc
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.