Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3dac0030b56da2…

MALICIOUS

PDF

85.0 KB Created: 2021-10-08 04:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e74ae218fcadd94c5741a2c45bdca368 SHA-1: 9291bdc84c4aeead0ac1f79e5a903b1634cfe15d SHA-256: df3dac0030b56da22bedbb6eee2bb7fbf718f28aeb9a7434578ca1c9e4e71af4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to redirect users to malicious content.

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 http://meghdoothsuzuki.com/uploads/leterakuw.pdf In PDF document text
    • http://maremania.net/img_pagine/file/temetovivovonawiwikujogek.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nupex.pdfIn PDF document text
    • http://dd-eng.com/files/files/80787569936.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/juvalofukutupugugidun.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/71557687616.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/megimuzoni.pdfIn PDF document text
    • https://kvzriu.org/images/file/95436873733.pdfIn PDF document text
    • http://clanlogging.com/userfiles/file/murumemeliz.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/xuwesopelazibaxu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/busepini.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/burukapaxulafa.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/volibogezogi.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/gomoduw.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/6089373185.pdfIn PDF document text
    • https://kapefashion.com/files/files/45619620529.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/sodujeb.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144f67be88c5---karizazowagenukevopotuxav.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/godijurikaxawamixefogipes.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/3691521363.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/31784933202.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/90482671087.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/33677239505.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d99904da2c88ff83fbde6fb806dec5b1/41413753952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+a+freighter+in+no+man%27s+skyPDF 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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 18644 bytes
SHA-256: 2d40e4644b436e0ae2b734c075c478a32b931772032618cd4a08d25f9c0953d1
font_01_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 10932 bytes
SHA-256: 2637b5c8274df7753988d52e3c51308af7a73db1990237e7e263457f87c00281