Malicious PDF — malware analysis report

Static analysis result for SHA-256 4810d507cd2ed385…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 14:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87c6b68ffc70c531e89f588d29dea17a SHA-1: 9206511f0465998447aaf895f15ab90d48d9fc75 SHA-256: 4810d507cd2ed38519f89bf030903e12f94d05dff75b12ab6203fd15a5d60b2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://cyc.cz/pictures/clanky/files/57383895134.pdf In PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tarekafikomunonizisetefeg.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/15720252904.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16147f788893a7---77771030759.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210912200037.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/jefubamejomegoresoxuja.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/42204639197.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/kudapagave.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/sukudanizifijova.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1f036b8---94921307424.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/fawuvafevewot.pdfIn PDF document text
    • https://angkalaris.com/contents/files/tizufuvivajujuzejofowev.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/14759515446.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///ribepawovonawaxasuk.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/13327086996.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/78344914177.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/mobupakevutirar.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/99066741086.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613223d011aba---41271848918.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/gebixodatotukutimipomuz.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/tuxujapukanemob.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/74064859023.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/bawib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=spooks+series+9+episode+6+castPDF 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_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 18476 bytes
SHA-256: 4ac9f92f63865aaab28291f0be0759d6869903ab2ea1a24aba25e87035eaa1a8
font_01_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10860 bytes
SHA-256: b3557cf601329c4054d82cb4facbd4e878b0d5c487bb67a3f07ad04e19471cbe
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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