Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0394233f4e2468…

MALICIOUS

PDF

77.3 KB Created: 2021-03-18 02:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 52c6837238b00ca414c1fba3ed1f8df0 SHA-1: 1b76a691de6cacabad993f637e23414080321a26 SHA-256: fb0394233f4e246859eb05a4fc3a3fb2fbabaeb5fde3d7d397a7f1a426851ea6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://zajinet.ru/wix?keyword=virtual+virtual+reality+apk+1.7.04 PDF link annotation
    • https://cdn.sqhk.co/fosuzonarefi/dgcjfhi/gijamilidejepilafiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_6046eb85ae208.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/VDHnPib/pop_time_for_catchers_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/hbejhjf/skyblock_minecraft_servers_1._16._3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_603a40d675bc6.pdfIn PDF document text
    • https://cdn.sqhk.co/papedajapej/Yib0jg1/leapfrog_phonics_free_online_games.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/GThg8hi/78120177289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_6036c1c57d85c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_6027eac8b7c2d.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/hemolytic_anemia_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/jejcnjh/typo_marble_2020_diary.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/rwidid6/boy_golf_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_602e1e8093be3.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/026db8dc-a45f-43e3-adf8-bbf807c6d60c/best_riding_mower_for_1_acre.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_45e48790f20b4d61ad83ab82844b6247.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_3a5b4382015d41149e27b21b01a739cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd87150d-8145-47d5-ad3a-6e758f87102d/how_do_covalent_bonds_form_between_atoms.pdfIn PDF document text
    • http://zolefajomiwa.rf.gd/78069132931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54b5193-7f44-4dd2-af82-f34e4ed638bb/kiss_the_rain_flute_sheet_music.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/animal_science_worksheets_for_1st_grade.pdfIn PDF document text
    • http://deritaserewivi.rf.gd/how_to_make_easy_paper_stars_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1af70c-22bf-4bb5-8bad-de40908c77fe/nouns_worksheet_for_class_6_cbse.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_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5220 bytes
SHA-256: faf93aaf3c05bceeec82748cc53b34142259555cc525c2bed9decfc3a0ef471c
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11188 bytes
SHA-256: 89b22ebf81121b7112d0ae96928feba7fe373b99cbd205ca3f2c28413679f296

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