Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ae70dfa82e5259…

MALICIOUS

PDF

83.9 KB Created: 2021-04-10 08:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8330db0dd42d09b96a846e97f77fc1ac SHA-1: d9907f1b9f110b10f01278995a651e565753295f SHA-256: 10ae70dfa82e5259219e0439fd50be76686e2544f0ef6fc070be83bd9fd15530
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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=por+que+hay+que+leer+100+a%25C3%25B1os+de+soledad PDF link annotation
    • http://hytri.com/twister_cast_aunt_megzw6y5.pdfIn PDF document text
    • http://kajipim.mypressonline.com/25555248666.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/les_cenci_artaud.pdfIn PDF document text
    • http://verifybadgesbusiness.com/zugiwuxogivebipiwalaeuhyq.pdfIn PDF document text
    • http://dulisakip.medianewsonline.com/4143098102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc985253e0ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5ffa022f438d8.pdfIn PDF document text
    • http://about-central.com/73554831120hccc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5fe24fd102779.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/33653090475.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/32005513209k6fyu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_601e675da8a9d.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/pilud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_60341b419ab65.pdfIn PDF document text
    • http://lolkek.xyz/place_value_activities_5th_gradepscma.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://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_b50163b7dec74deaadb9c8c21b912e6d.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_912d75e27d7b4a55b44e7f2fde399c96.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_ffacbed3e9904caca5909722111627fe.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_3a480616c7054f419bd09416873daac1.pdf?index=trueIn PDF document text
    • http://pubejasebalodo.rf.gd/tofesesikasulagixo.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_3db15fcb99954b7c9ce274d747580372.pdf?index=trueIn PDF document text
    • http://turojupa.epizy.com/ruvenerigojavagenawirolin.pdfIn PDF document text
    • http://vovugawe.rf.gd/how_to_start_simpson_3000_psi_pressure_washer.pdfIn PDF document text
    • http://lezefivupeke.epizy.com/45313219247.pdfIn PDF document text
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_e70613035750414aa4e3096cecd97301.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_a8de7ca52c3a4f4da345a8373a282833.pdf?index=trueIn 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_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 5196 bytes
SHA-256: 160561232fdf4262ef8eef32398bb78f7399d52818b7153269bbb1104c91079d
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 11524 bytes
SHA-256: 9db61cb3f4a3e4d46c35688965f386e58e3860ae3f1598c3fb64524ea6a3c462
font_02_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333