Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cae55b55add927…

MALICIOUS

PDF

98.4 KB Created: 2021-09-17 11:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3937988b2608c373cce24c64a012f494 SHA-1: d9fb05ae7ddb40f514bc5017fe8b9aa4ac89bea5 SHA-256: 34cae55b55add927d4afb0b4a790af18f2f8784ec52857fc4af8a8c684abccd6
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://panama4d.com/contents/files/jevixizepavefolixekaxu.pdf In PDF document text
    • https://sarvodayasamaj.uk/upload/files/68328597104.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/36224325295.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/govijogososevunesaj.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/pakikimodawuw.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/ziwotafomibofan.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/parusirexosinavomir.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427066d18e5.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/zokogo.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/rodesut.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/6847551055.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/19417013562.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/70807768418.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fotajod.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/30488586354.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/31997905338.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/73901943039.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/tiwilisiteramawuraw.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/wanokijobozakataxubaji.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/lewaruzev.pdfIn PDF document text
    • https://pokereshop.cz/data/file/gidarululozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apk+install+on+androidPDF 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_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 10328 bytes
SHA-256: f8855315bd09bd245d5c30e676b5adc8283d86bbc0a2cc167b484d661d8b408a
font_01_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D03 18044 bytes
SHA-256: 21359afe917e9fb58953f9c75c79daf73273552d62f4f311ac9c09eeb9f1213e