Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c21f943b0f2390…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 08:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b38538dba954ca34d549b3bc7a405126 SHA-1: d92eaa894a4a140a3c0349b08952cc1ccb04951b SHA-256: a0c21f943b0f2390a325ec13773637379d7a20b451dd8207da0de3f08eec09ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing a secondary payload via the numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://artospace.com/pics/file/delirategib.pdf In PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/xigufubome.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/59551082462.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/9261520215.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/20810159612.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/fowivafulozin.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/25385065091.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/14695041104.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/jagusejap.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/33412606487.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/xunosexujunorura.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/46144601872.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/patakuramesusapis.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/murukenipibasugupineme.pdfIn PDF document text
    • https://pellevah.com/upload/files/52667344397.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/vabipiwe.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/20/xupenigosus.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3536983688.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/furivilufapisorewu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/godupogimesitubemusar.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317ac776f09---nuvabubipewurisibarosowo.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/232323011656.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/viduxogewudadikodemekos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+open+jar+file+in+androidPDF link annotation
    • https://mediaget.com/userfiles/files/94900763047.pdfIn PDF document text
    • 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_off0000b704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 18612 bytes
SHA-256: aa4391bd3da09742aba0342acf8014e71b796a12d693ee0d9e591108f4f19251
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 10532 bytes
SHA-256: f19bbf533d77d699b5f02f59446c9627b346158b303dad12d06d950ce4a3a73c

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