Malicious PDF — malware analysis report

Static analysis result for SHA-256 1135753b5823f22d…

MALICIOUS

PDF

70.7 KB Created: 2021-03-24 18:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35bd930b2053b481d92cb60fa3690a58 SHA-1: 9ae267202c2aebf86090a7f44b61415bf9fa5a17 SHA-256: 1135753b5823f22da1b4bec86246fd3256857d615a6ffbdc3aa3bf62e80f526c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://botokaw.ru/award?keyword=brunner+and+suddarth+handbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465000/normal_6039d760e55f6.pdfIn PDF document text
    • http://aduo5.online/how_to_program_a_wayne_dalton_idrive_garage_door_openerayhzd.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/linear_algebra_4th_edition_friedberg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_6056d9e3ab83b.pdfIn PDF document text
    • http://ropewelopison.iblogger.org/analyst_notebook_9_user_guide.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/james_baldwin_collected_essays_paperback.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/bt34Iig/17977720980.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/hbggThi/zuwiwoxuka.pdfIn PDF document text
    • http://vilelares.iblogger.org/36531024814.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/nzvbifV/62582181473.pdfIn PDF document text
    • http://snegny.com/new_yorker_cover_march_23_2020i5ajp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6027758fbac96.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/BenRpib/pokemon_go_news_update_niantic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwuriru.onlinewebshop.net/nakifujajapolawemirilo.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_1fc003464d464c948e40cd163edd0089.pdf?index=trueIn PDF document text
    • http://fokavugepiromi.epizy.com/clothing_catalogue.pdfIn PDF document text
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_221fd6bdaeb542758876477d1d674055.pdf?index=trueIn PDF document text
    • http://bilunijo.epizy.com/77365472050.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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 5348 bytes
SHA-256: db3e0ed665191a7a59d76475584dbb9cc3e528391b5de3bd9acab519fc2bdf8b
font_01_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 10540 bytes
SHA-256: 5a8298eff462d67540aa7ab4a4f27db584c3337886ffb1d9377335db21ba09e0

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