Malicious PDF — malware analysis report

Static analysis result for SHA-256 68af0c482f72cdef…

MALICIOUS

PDF

71.9 KB Created: 2021-09-22 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b57b856a9ac015263d67eafa8be2a26d SHA-1: d34ecb67e379fdc6dd2e975b262fc6e3d88ecba3 SHA-256: 68af0c482f72cdefe9fed032b6dee4a48395145d186d70da3ffe062558b79e09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bsbcarpet.com/userfiles/file/71263355782.pdf In PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/zidoviwavodufemirire.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091702435173499.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/wujilem.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/gajax.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/52355379681.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xofotofuxiwofusam.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/vosotewozepojesa.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/60097676072.pdfIn PDF document text
    • http://arablift.net/userfiles/file/pazixojuz.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/rurubevafuliburuvotuxolox.pdfIn PDF document text
    • http://annabarons.lv/files/files/zutifokakewosowatap.pdfIn PDF document text
    • http://htygroup.com/upload/files/64518367395.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gupudufudinotirew.pdfIn PDF document text
    • http://rvhifi.cz/files/file/mosuganovakosinoziruf.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/64f7uchjcf01ltbsb8gcms4i48/78316328379.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/kawawevuzotopu.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/xeruk.pdfIn PDF document text
    • http://zimmerei-possert.at/fuwemetesepedasapodido.pdfIn PDF document text
    • http://www.polni.si/Images/files/wapajemowivofure.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/dubixirimazuvikopugo.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/87079992700.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/vutuwokafirabegi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/35837947116.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/30999341215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=good+bridge+designs+minecraftPDF 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_off0000ba67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA67 15220 bytes
SHA-256: c9e85402d17978738c3e6ba56409380067239a39af7820ea00a1fac258cc8f05
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10952 bytes
SHA-256: ed9484f321e716ed72aacf0500fd5a2afbd6a8335a3aba9bb33555f3bb4bf2b2