Malicious PDF — malware analysis report

Static analysis result for SHA-256 e169b99319b63524…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 03:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24bb78723d73b1d59fd9357d52a332d7 SHA-1: 3d9d942e1c6dad2d296316fec1f5d4ad2b36704c SHA-256: e169b99319b63524a33218f0ed1a14cdc17dc2a23f3f85fc07c4c09750239793
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are structured to appear as search results or file downloads, indicating a phishing or redirection attempt. No scripts were extracted, but the structure suggests it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://ansatrans.ru/admin/ckfinder/userfiles/files/vaponowaf.pdf In PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/serexodedepukaxovetax.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210909230206.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/momewubozes.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/34747038631.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/39796314104.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/movamopelokuja.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/21106354368.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/mevowikak.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210920_325C161637AE7D98.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vupolupepifosadomomusiwi.pdfIn PDF document text
    • https://senfina.top/uploads/files/22689586899.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/83227877960.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146738e6682b---pomuvuwojexid.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/51371318007.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/20619417029.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/denup.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/19343920444.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/41791122094.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/54946188760.pdfIn PDF document text
    • https://spacio.hk/attachment/file/duzowasegutoluwutinegomil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+read+only+file+systemPDF 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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 18048 bytes
SHA-256: b5e2b237854a81012043b744a4fb0b05bb507e6ceb780695eed9a139ed0235b8
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 10612 bytes
SHA-256: 6a56f47c22b9959ed036a00244ebe87b15d0107894a4329d401e92ce79fd1409
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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