Malicious PDF — malware analysis report

Static analysis result for SHA-256 747b0365df9f6ac1…

MALICIOUS

PDF

72.9 KB Created: 2021-03-30 17:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5d67922cbe00fe854c56911d35643b99 SHA-1: 5363cf99d7f03d5f338e8ea178f36b917dcb5f14 SHA-256: 747b0365df9f6ac1a725392f28d18e0c965e6d32611eb281c12cdf6757f84293
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 0.9995

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=elton+john+tickets+minneapolis+2020 PDF link annotation
    • https://cdn.sqhk.co/badimoweba/jjlheii/accidentes_laborales_en_enfermeria.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/jebagiwemeviju.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/9gjgchi/shelterlogic_tent_sizes.pdfIn PDF document text
    • https://sawasorepe.weebly.com/uploads/1/3/0/7/130739445/xatisevoge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5ffa4dd29483d.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/199ce79b069083.pdfIn PDF document text
    • https://cdn.sqhk.co/xugavizira/ghsPggc/55415931554.pdfIn PDF document text
    • https://wodirukuz.weebly.com/uploads/1/3/5/3/135398055/teritipaxi_jagatelubot_sesepiwov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_600fa7431e5ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_6036c6b626dc2.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/LpgihTT/seashell_chocolate_molds_hobby_lobby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_60397a0d63361.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vudivuzakal/bajaxezu.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_08c5e0d792ea4cc3ae25e29a8a3aa6b7.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_c39e99eccad5478d81991c300b635c5e.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_df8bc9d72bd6407298057a9ddc6a4ead.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_595cbaa92551458fb73d26c372e43c8f.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_f18845d00fca472abec423af439367c0.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_8b6a95390482426696440638b25f3f1a.pdf?index=trueIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_103cc7fd44d14e07a5969d5500a3cc43.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_7e6d7f67a09d4934ba6a51e3d95ccf3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/archero_apk_ios.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 5236 bytes
SHA-256: 425472316fb46d3a19954f3cb366433cced82828e631ce53198d3187b97ae3ff
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10304 bytes
SHA-256: 3635b756098b79b274151e9fff9db5c19f79c26e2f66895e42d9ade3b46d5906
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3