Malicious PDF — malware analysis report

Static analysis result for SHA-256 495c8aa2848d5274…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 10:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c438cb8c1004651129b87a9d8b8b4010 SHA-1: 1cc70a58de0f3dd7b67974072e174c45e9ed48e2 SHA-256: 495c8aa2848d5274ea97a8b21407d89478a82a1db19baeb2348a01f42c7ffe7e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://debeleven.net/UserFiles/File/23636346160.pdf In PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/sijakufudar.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/2562972288.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/wedoses.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rigikapafaresuvigetedawuk.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/67594207472.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/semufawo.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/xemofasepejebo.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/45781224551.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066736ccdd---vitozurasikodibevomabubuz.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/10904917354.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/55789696844.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/gukatuxuvas.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/mikuvuwefeg.pdfIn PDF document text
    • https://network-italia.it/file/guxojali.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vapevakuliroridede.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210907070811368851jmsic.pdfIn PDF document text
    • http://myslizdrave.com/soubory/dopurafusuxitigakelov.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/28875397629.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4gaitpl4jliglcp6pml4csk6k2/wazuwegerimajuxajedeliz.pdfIn PDF document text
    • http://kgmda.com/upload/files/rafevawemegizodafaf.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/74396576744.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/48863595784.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/33496556921.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/kivinuli.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/muradaxajelipijuletig.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/66882957479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=otg+tidak+terbaca+di+hpPDF 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 15980 bytes
SHA-256: c93b6d3f846a3ce4f6c9220cdee7a233d94a6843bdf65d8bcbcc1f7b66c3c619
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 10612 bytes
SHA-256: 3dcb12c784df00d2605cd82a09ed83bedc4e486fbc9bbe8eba73a650af48228e