Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e1c91334250dbd…

MALICIOUS

PDF

67.9 KB Created: 2021-01-16 14:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b590e6cb67d6676ce919a8a2cf6fe032 SHA-1: d20446d00c5b863aa6a6467d55020c0dba9630ae SHA-256: 75e1c91334250dbda8d3a855daef1cbb4f0dd6123fa090db9610f40b6c3b14e7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or redirection mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing software, a common social engineering tactic. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffset.ru/aws?utm_term=absite+smackdown+pdf PDF link annotation
    • https://wuneregogituweg.weebly.com/uploads/1/3/4/6/134686440/sotutawefumid-gowukarelovizu.pdfIn PDF document text
    • https://mawubuzepegi.weebly.com/uploads/1/3/3/9/133989242/c09f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_5fe999e9e55cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5ff61ca924a0d.pdfIn PDF document text
    • https://site-1180086.mozfiles.com/files/1180086/nejopid.pdfIn PDF document text
    • https://site-1245721.mozfiles.com/files/1245721/68301268855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/teacher_appraisal_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/87648389232.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/logiciel_pour_fusionner_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/38908461192.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/50819110299.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/product_development_business_plan.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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE91 5460 bytes
SHA-256: 010fed69f388c7de95e7085a72cafb2bfaedddab3e4a4fc20184d2dab9fe54e4
font_01_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 6172 bytes
SHA-256: 468c62cd94fe8adb1da87780846cdd0104bc1d8c4005174a76e4ef1dca2f2ea2
font_02_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10264 bytes
SHA-256: b952eb30530add27211145e9505959940493aa192a6a212ab4696ef5db156d35

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