Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7004605a4b4a36…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 05:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcc829d566e59b931b5baa5534266792 SHA-1: 2dafe76f8b18dc399e45db0e0aa6eb84c891d771 SHA-256: dc7004605a4b4a36147b87769afa8c489270c46a5f5d90eeb31895e4e96cbd0a
126 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to potentially malicious content, and the heuristic analysis indicates it functions as a link farm. While no scripts were extracted, the overall structure and detection suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfc0cfffc---61313310524.pdf In PDF document text
    • http://pataibicaj.hu/userfiles/file/xijajamuligatexapebusofa.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/36573178100.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/kaleveloxuvu.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/88193514646.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/vifowijezepolebi.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/89714918250.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/tawiwogovapovapudufanore.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091292633_674288262.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/20766361802.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/35389695219.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/66742298770.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dexut.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/mividajutejudatitodit.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/jirer.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88939976265.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/gugopufevivavunosuruvu.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/76570549420.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/70164537422.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/ripujevifironerafatu.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/nozekifepuniziluguxu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vevawitotovevakuwiwedu.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/93667646069.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/46594025182.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/sevonugoxube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bhag+milkha+bhag+movie+download+720pPDF 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 11200 bytes
SHA-256: 1550488c1cc5710d4a15d5664f98b5ae6dc60ba98359339156c8105d12dcd74a
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 17440 bytes
SHA-256: 481aaf05f48061db3cb09a3e4a2468b9131d1def9ddd00247becd5a5f487b5d0
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1