Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b7ff582997fb55…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 13:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f02baa356000652ffad10475d328eb80 SHA-1: 6d9e8d2b332ade9449978554100c81ba80c1d9bd SHA-256: 05b7ff582997fb55404da713b51e09fb1004126323fe0262f9a9631543fedf90
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as an image-based lure, typical of phishing campaigns, designed to trick users into clicking embedded links. The heuristic 'PDF_IMAGE_LURE' and the presence of numerous external URIs, including one pointing to a potential link farm, support this assessment. Although no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect users to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cisseo.net/userfiles/files/fukovuterawameje.pdf In PDF document text
    • http://infinijewelry.com/userfiles/file/46283266423.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/20063910237.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/xanal.pdfIn PDF document text
    • http://npas.ru/pic/file/31701628327.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/24929826691.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4deccd97cf4dc118ea6efb458905dd5b/84389616328.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/38965323005.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/81633056012.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/bujajarupozidedasuwiw.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/46245827230.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/20788524265.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/xevabefagajenulavi.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sazagatamisifudeko.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sigaf.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/19703879521.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/92967676888.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/zivaratimiditurunefejer.pdfIn PDF document text
    • http://storemisr.com/uploads/files/tenetuwijesa.pdfIn PDF document text
    • http://www.socfertenviron.org/cmsfile/contentfiles/tixaguvenolinuzoromepojed.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/52662546507.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161501f7c980ad---dukazenerej.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/navoxelavoxowugevojemef.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/nisodenovonuxafizot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gta+san+andreas+download+android+100mbPDF 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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 10848 bytes
SHA-256: a0b550ade6fb0390bf29e608fcd36ed2afbaca8654368b43b19db92d7d8d16ab
font_01_sfnt_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 14464 bytes
SHA-256: e06cb7cf7a6998174c388d71d5794ad2912ad107b4b1df329707a76d8d886e84
font_02_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1