Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edd5ca4da9edc83…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 02:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 766891ff745d51f1ebbde65a7b0bbee6 SHA-1: fe7a632d046951beead07fc4b813c71dd15346a5 SHA-256: 8edd5ca4da9edc83e7badbd443de6b11a9704cd0d9ef908a44beada808da91e7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which are flagged as disposable or unknown reputation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://khmim.com/ckfinder/userfiles/files/59916290873.pdf In PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/72345860125.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/dudenufevituxujug.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/kavasolojogavuxulise.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/74982274278.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/97870798104.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/78827898722.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/92675545952.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/51631706367.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gepasegejelaguwafutif.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/63207641875.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/53786841006.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/6284849388.pdfIn PDF document text
    • http://tyextractor.com/d/files/jobemeseruxolono.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/votuzodirisunoxedu.pdfIn PDF document text
    • http://perksys.com/userfiles/file/gikexekobipexijimojol.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa5467694---45887634508.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/22230894872.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/50966516947.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/sajekojorexiduk.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210914085325.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/48201638977.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/37028959331.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/xusefenamilozurejuni.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7176ec8c---sapazebabotamofumosak.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/sonibilagituronoweraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=inspirational+words+beginning+with+iPDF link annotation
    • https://mediaget.com/userfiles/files/senusajezub.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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 10848 bytes
SHA-256: ac38985c9cc346dc1b0fb80be9bce1484fce2043a8d4d887e413c1ec2c8d4a38
font_02_sfnt_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 15088 bytes
SHA-256: 85881bb9023ff810c1e8c3c984987543febab40a6ffc7f60f8a22f8c16bba31e