Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3e37725450b462…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83278dd7bfcacb3170b01f51ee1d3d73 SHA-1: b089dfe3d89802ad86ddfc5ddd77b62513e578c4 SHA-256: 9d3e37725450b4625fd53826619fdae7fecbde7afe6d530a83daf24893935b46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hro.ait.ac.th/js/ckfinder/userfiles/files/63335501141.pdf In PDF document text
    • http://uniradioweb.info/userfiles/file/goboxikakexo.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/92905795913.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/28208087420.pdfIn PDF document text
    • https://henuopack.com/d/files/vesisadozozekoziwuzemig.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/31896985474.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/lirimolune.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/31338520606.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/37250314395.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/32069485157.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/50964811543.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/1690013793.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210902/file/33099799754.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/kapokewijudazaperiso.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447cc2e6d7f---tobonuwukadezeraboxuko.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xinusebebiwisitufod.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/98320209776.pdfIn PDF document text
    • http://fpole.ru/sadm_files/36675805661.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/18915054965.pdfIn PDF document text
    • http://egitara.com/upfiles/files/jisanikaguwavubabepimelan.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/luvonuxatat.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/87015148646.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413fc4c3026---pupavovar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=camera+photo+shoot+apkPDF 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 10396 bytes
SHA-256: 4ad1c47fa5b630306f826d7f2377dcef71a4fb719a505bce362a4f116d109cdb
font_02_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 17736 bytes
SHA-256: d6687a20dd45cb01356a702d5ffff1f5418e7b5a783a0bc0c9ede13cfb6653d9

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