Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75537f8e58a7ebb…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 21:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1654094fb18a8399e27f550095a3e69e SHA-1: c7457affbf999d3ad43fe2b6b80a15a5167692d1 SHA-256: a75537f8e58a7ebb5fe36ac17889a8860deb8f39c2fe865cafe053022fce8f8a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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 https://jacksth.ru/wix?keyword=kingoroot+apk+android+6 PDF link annotation
    • https://cdn.sqhk.co/kixagixupo/eNkMXIk/gurodugorubepefidipiw.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/UYghdgi/59948741044.pdfIn PDF document text
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/sosuruxovepaneke.pdfIn PDF document text
    • http://arfeshome.com/73179246112j8avj.pdfIn PDF document text
    • http://getveran.site/dagidilewumawukufz9q4.pdfIn PDF document text
    • https://rewemaxokaw.weebly.com/uploads/1/3/4/7/134748572/10980071ae8cc3.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/xJ19jfw/dololuveparepobejipepexa.pdfIn PDF document text
    • http://mesretly.xyz/juxuzomoweberofuk59lt6.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/ieHyOn7/wowubikagereriger.pdfIn PDF document text
    • http://znalomstvavip.site/vupugasumimesawatajikex5gl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepikinol.epizy.com/muzubas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8a8ead-71ac-4666-9d9d-10fb9b68409d/excellence_in_business_communication_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cee9dcf-cc05-448c-a943-400c9e7d0499/bufalifuzexat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836893f8-4b6c-4033-a312-3d5ae003093f/39166243183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa644e8-fa8e-4ec2-b988-c57cfce4b053/wivojaraginogiwawidatu.pdfIn PDF document text
    • http://desegovofefapin.rf.gd/barstool_bets_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ce90a9-c23d-40c9-8e30-9e2db016d4c4/mosesodotupixegox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656d3109-689e-47c7-aa6e-6773279caa5e/rirojagomaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643cbca1-b737-4f19-aa24-9b9f70ed7518/twilight_2009_dual_audio_eng_hindi_1080p_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed56d3f-087e-4819-a48a-e4ebf5567e31/xofuvarelulejit.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
    • 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_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 5104 bytes
SHA-256: 8e0168e5187300f7c4972091ca51ddf81e0d00a4a5f2b38c39dbbf67ff67ef44
font_01_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 10552 bytes
SHA-256: 0956367dc35bb60433bfd3ed43b5cf87a73082a01609e5e7087950bd4e2fae2f
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16076 bytes
SHA-256: df8916dc0488248139c8b7f8575cdad52201066875df9eb3f38f8be7ce625b0f