Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27218d70f7dcbef…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 00:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7763f4820522759720b013b986dfe7b0 SHA-1: 3ec0d1125f70e96540e15b72440da2b607f7f90c SHA-256: a27218d70f7dcbef223f763e784634d480f169531a7fbb72cb2548e392955bb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious content. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://berbagiangka.com/contents/files/zagipiganokuzijo.pdf In PDF document text
    • http://drapa-technika.cz/UserFiles/File/52076429133.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/81114594120.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/16649199967.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vazufojavul.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/23462368424.pdfIn PDF document text
    • http://workontext.ru/media/file/mefukujexatenifowevixega.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/gezadapoxodajibum.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/11871066193.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/keruzak.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/98792674572.pdfIn PDF document text
    • http://taigesw.com/upload/files/fojuvogunesenuwimil.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/35997134343.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/gutag.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/44209167397.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/52c4c7195fb9a7f5f16c172eba901202/wosepemipanolojok.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/33486815907.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/nadalalekegot.pdfIn PDF document text
    • https://geniodelweb.com/file/nekofixasijovozenala.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/27949547458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+hide+app+on+androidPDF 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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 17052 bytes
SHA-256: ac82094b6caf665bb5288d279663328f32cfefedb58b0714bbc976c3addb7159
font_02_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 10424 bytes
SHA-256: 4eb966dc05374e945d90f5decf2b2f0244b4b1b69833017bc18fc93d3984d7eb

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