Malicious PDF — malware analysis report

Static analysis result for SHA-256 738813c41a05cc15…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 01:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d6af5f46045c0544c5654a5d0aeaf572 SHA-1: 46a801d626fc4f948e51a2c3287dc3cdae3716cf SHA-256: 738813c41a05cc15c831457c74523c47dbe51a30441062c36eb7d74ecab78db7
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://vilenefex.ru/wix?keyword=magic+tub+and+tile+refinishing+kit+spray PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5fd6fa759dcd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_601cdc2c25a87.pdfIn PDF document text
    • http://minuette.me/the_jesus_mysteries_documentarydojfm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5ff2ab71de5da.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/ib5jhhg/dorosifopuwogegujojep.pdfIn PDF document text
    • http://topsol.xyz/797370655368i56g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_604166bb276fc.pdfIn PDF document text
    • http://smallita.space/flicker_free_serial_macum24t.pdfIn PDF document text
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/faxijudiviviwa-ziwowagofi-kuwawikit.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvivazonewa/UcidBh2/hole._io_bluetooth_multiplayer_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_602e6727c982e.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/pidavigegoxi-badetuj-kunorod-zeraxipuduvigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5ffa1d2851cf7.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/lovuxoxumuzis_gafaxidojapunu_bikireseju_gunazapepijivu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383703/normal_5fff67fa1770b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6025b3705d731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_5ff005cb76b5e.pdfIn PDF document text
    • http://artyom.guru/define_current_liabilities_balance_sheetbiboe.pdfIn PDF document text
    • http://cocobuka3.xyz/652119335003nang.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_6047bc6a83805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe4167433309.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 5728 bytes
SHA-256: 5be5f602a94d5b7d4914b7b5cddac77212607debb9545598ae2080edc56e0a3a
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 10156 bytes
SHA-256: 8ba0770c76064768b73f75831791b38bb7b33db6f3211b0c604d29f36c78893c