Malicious PDF — malware analysis report

Static analysis result for SHA-256 95498d85f0479a67…

MALICIOUS

PDF

83.0 KB Created: 2021-04-06 00:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6e40916d5a023e72d912a46a540c8aea SHA-1: 06a60523dcc4dce50b6d94374175e567fdb94387 SHA-256: 95498d85f0479a6754375c855d33b403f17781113fef6e29b8e9fcdc473cfb03
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains or link farms, indicating a likely SEO manipulation or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_LINK_FARM' suggests the document's primary purpose is to distribute links, potentially leading to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://xezojetit.ru/strik?utm_term=2.0+fsi+engine+code PDF link annotation
    • https://cdn.sqhk.co/juxerawabuf/gg8ific/brick_breaker_classic_apk_download.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/31186ce79b82fc.pdfIn PDF document text
    • http://rapanus.22web.org/nepubobegesoxelun.pdfIn PDF document text
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/37d6dd51.pdfIn PDF document text
    • http://petuvinopezana.iblogger.org/centerpoint_4x32_crossbow_scope_yardage_lines.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/gegjkgc/world_slot_car_racing_championship.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/2QHggha/naxuvisodowufatejam.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/wijegep/barcode_maker_software_free.pdfIn PDF document text
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/0897e3994c0.pdfIn PDF document text
    • https://cdn.sqhk.co/peposusuwi/haDK9ij/android_login_template_github.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/robuwedid.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/jfgdur4/oklahoma_national_state_parks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodolipifonabo.epizy.com/beowulf_holt_mcdougal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76655c04-a11d-4ae8-9fc9-88eb8c74daf9/diamond_infinite_edge.pdfIn PDF document text
    • http://nakulugexogi.rf.gd/9069949352.pdfIn PDF document text
    • http://lixarexusol.rf.gd/jaferud.pdfIn PDF document text
    • http://patifevul.rf.gd/cheddars_menu_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e9042d-30ad-494a-841a-7435bb6616b5/86326080523.pdfIn PDF document text
    • http://divojeniro.epizy.com/arduino_ide_user_manual.pdfIn PDF document text
    • http://jijetebum.epizy.com/wazabelosusuworebako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafee0fd-e989-4da6-b684-0f269356d142/5439694712.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_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 5060 bytes
SHA-256: c1ac4a47f503eb7033ca64697c0fd099c8333092002346e894551017aeaa8d6b
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 11868 bytes
SHA-256: 3c3613e58bba6344f1c7d2b4ff65ccafe933a500b906f2dbaae6ee13d8582368
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1