Malicious PDF — malware analysis report

Static analysis result for SHA-256 7378d576c35785e4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 02:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3810d60f570faadaf720e0a74f72bc97 SHA-1: ddbb5303e2012bf17a374b5db562341526231110 SHA-256: 7378d576c35785e45a2e2b496bf10295c0dff5bdc3592bb26efcfebc36a00607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is used as a lure, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://linhquan-group.com/upload/ck/files/57633567680.pdf In PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/68429140576.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/67769040390.pdfIn PDF document text
    • https://fratellifurloni.it/file/48899064138.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/dukilup.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/70314830839.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/bijibowebowe.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/lilep.pdfIn PDF document text
    • https://wittnebel.dk/file/67571659093.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/64137022757.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/10724111747.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/40192230336.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/96043430296.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/17698594746.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02c66268f---nafojatokekugosevojin.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c4915b03---12307480378.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/32973071235.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/35994642644.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/92418690483.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tevomepa.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5003a9899f0002986a076a87dad76f5a/47214485609.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/mumuz.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/xaninolomelutafusi.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/7336533773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=real+boxing+apk+hackPDF 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_off0000b6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DC 10668 bytes
SHA-256: b60965f2737fd89681b12878ed65440b4680df8b388592942d950f4ac753acaf
font_01_sfnt_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 16216 bytes
SHA-256: a62eae564c794e508ddeff93cc4213fa2d4c7d01a7ef7caa1e332117413a1b19