Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4371b5239706351…

MALICIOUS

PDF

79.6 KB Created: 2021-04-02 22:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bfd46f041a28dd050675fd6946cfd94a SHA-1: 3c39e19b72a61c4eff9dfad7532a2d0b6fb84232 SHA-256: f4371b523970635195eb0e7a889afef73ea64d4bf74c8b90ecf4befeaa593708
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://lozipotod.ru/strik?utm_term=the+landlady+analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=the+landlady+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fe3bec75b537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_60320a5923700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5feb6db5b09ef.pdfIn PDF document text
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/lurikotefe-bapozivuw-xosubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499656/normal_605f5e876afb1.pdfIn PDF document text
    • https://pewenotevis.weebly.com/uploads/1/3/4/5/134597539/jewumepagiso_wuxolegekam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_604dafd3c8829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_605d97aa266e4.pdfIn PDF document text
    • https://kazarebowuw.weebly.com/uploads/1/3/5/9/135972211/dewefukosa.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/wovukidasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_605d5ac6b700e.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/2623884.pdfIn PDF document text
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/292043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497368/normal_5fe455c301de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fec50263b632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9543a14-ee60-4c12-97d6-f80016e0b529/zyxel_pk5001z_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11eb3af1-941d-4e87-952c-094d89ab602a/pokemon_liquid_crystal_walkthrough_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd606df-0871-4929-84da-d08f35719032/soccer_coaching_courses_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629a64f3-5e17-4d78-bd13-6a6d203742bb/resumen_de_platero_y_yo_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9358e61e-928b-4cc9-83ef-97b3c9074b18/tiputegojajafizatufipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32441e8f-a005-4c8a-a9fd-247afe7b9d29/quality_management_plan_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb96c5c-29e5-4837-a3c8-11d3c32e96be/john_deere_2653b_parts_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 4868 bytes
SHA-256: 90c07c1d149379c9ccafa548a71378691e2dbc8cd95c0a40fae8d3f959f7da72
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 10416 bytes
SHA-256: 4b9e780b7ac075fbd7c6a20416eb4687167b9d818e6f5a64dbbfdac10d47345c