Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f036aa5f657294…

MALICIOUS

PDF

85.9 KB Created: 2021-10-25 01:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b36f8f43f22bff629fc1159e112a5282 SHA-1: 3ed3504b9ba30c4440796ab512623e88f89daaa8 SHA-256: 94f036aa5f657294eadf54b41962e57c4fadc9e827b42f81251a360b51554998
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous links pointing to distinct hosts. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://medicentrumnz.eu/medicentrum/files/file/gaforepetevakuvawejev.pdf In PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80274646627.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/mavujesido.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/3447944318.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/6330450031.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/52412186366.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/doluxerizabavagi.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/52375045924.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/maxaxuxapopukesefaxe.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/pirumupajuvukezuzelejipe.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/sonuvukolerisiz.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/74482553034.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/zazozogowabaliwusuxidezi.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/jutaxegukasiruselume.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/80405803096.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1616626998908c---luxapovubawakuvupivezuz.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021100707034173499.pdfIn PDF document text
    • http://bednidhitraders.com/userfiles/file/vuwizajijar.pdfIn PDF document text
    • https://coluer.ir/documents/file/misabejesokikurasi.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/mikas.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/wuzukumut.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202110120904274783.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/xeverutowiwizede.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6vmt4g94fj07rar0e2f60i4l7v/depomolotax.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/10817202080.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/fixuzizamudefeligiz.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/xowijenaresikofusib.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=agriculture+department+jobsPDF 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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 18128 bytes
SHA-256: 190cb4bac759ef2e5ef6a5089feb1d3cff035f8649390e445776f084864f6997
font_01_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 11208 bytes
SHA-256: d311744800daa1a8d7da934dcd173534bf02d3357c190dd26b59b9d0d079b9d1
font_02_sfnt_off0001316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1