Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33b2544f18890db…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 22:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5febbf382043d5a72fe8e654421ddb5 SHA-1: 3c642722c4d038d6ed38b8bc1ec22be6191a6a21 SHA-256: e33b2544f18890db9df380d532fe88321c607fa02a9efceef85936d03d906693
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a likely attempt to redirect users to malicious content or phishing pages. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, suggesting the PDF is designed as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=6th+standard+maths+digest+pdf+download PDF link annotation
    • http://www.cottagegrad.ru/files/file/12701867847.pdfIn PDF document text
    • http://renknh.com/ckupload/files/83541445935.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/sevojudogixefeb.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/jejagud.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/fadumowelavu.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210903_6EB86EC353DCFA01.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/43197701575.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/87908334993.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/7682619468.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/kitolututemunukab.pdfIn PDF document text
    • http://primaneighbors.com/userimages/74957360503.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/perexerokozowebupo.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/suzezoxuwizev.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/81310208657.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/sutafefexisowitagukeno.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/dagurepirij.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae8cbb0e3---59031806596.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/regiberazizidem.pdfIn PDF document text
    • https://ibextrail.com/editor-images/wubebisosoge.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/40703829004.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/xedujulutubudiruwa.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/kurijukonamabedutasi.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/gunamilavudawisitoti.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/salolabebazotepezower.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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 19828 bytes
SHA-256: 22b73a74e1643efcf8ad5e026bfbc345aa1fa20f63b24ce833025c214deead2c
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 11100 bytes
SHA-256: aec29f65f3e7f908d5669eb613e361257ebe44cea645af8b887815e61e4297c2
font_02_sfnt_off00012953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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