Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3cc8b452d8eaf2…

MALICIOUS

PDF

76.1 KB Created: 2021-03-12 12:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f6add57d017a4eb4deddc4ab375eff2 SHA-1: cbef6ea417090e33fc7d0c182d64dec9d7b952de SHA-256: 3f3cc8b452d8eaf2e9bfcd6044322d12bb129b7f8d9c5d730ba63ff9c6d1b508
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 0.9997

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://soxebez.ru/wix?keyword=relative+position+worksheets+for+kindergarten PDF link annotation
    • http://9gusevshop.space/zalimebixejusesutidc2b9q.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/xojojufajozewuza.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/G1aCiia/gamechanger_team_manager_community_pass.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_602307702a199.pdfIn PDF document text
    • https://nusuvonofa.weebly.com/uploads/1/3/1/8/131872273/965285.pdfIn PDF document text
    • http://stnold.com/46652013761ug9o7.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/4381734.pdfIn PDF document text
    • http://sneakerspapa.store/diwurugafipisirukukigufopndrd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_6043f6ddde962.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/mudagonomomirilam.pdfIn PDF document text
    • https://cdn.sqhk.co/zivunegas/jiigjgO/gabidabexasa.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/QjaCjcZ/bezier_games_one_night_ultimate_werewolf_daybreak.pdfIn PDF document text
    • http://nickned.me/how_much_does_sql_certification_cost23r9o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_704acbff4aab4ee0a697bd837421f25f.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_59be63837d73423ebbc14f04b5d235c6.pdf?index=trueIn PDF document text
    • http://befonixepar.rf.gd/how_to_plot_simple_graph_in_mathematica.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_430c1393121a4756868b506e558f69c4.pdf?index=trueIn PDF document text
    • http://dikubok.rf.gd/super_bass_tamil_songs.pdfIn PDF document text
    • http://pazatirademe.rf.gd/deep_learning_chorale_prelude_questions_and_answers.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_98d8d785491f46dab13b2f6e2578e84b.pdf?index=trueIn PDF document text
    • http://magajavopisili.epizy.com/dubupelegugenanivoditas.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/bharathidasan_university_phd_guide_list.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5528 bytes
SHA-256: b02423ad1d9d446448514913e3ffabb7e475c7d72e2db6013a5ae78d2556612f
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 10628 bytes
SHA-256: 601991eb777445c41d0a56237e6e2a62ef6a76c5f428c35c7538adbf1dae0317

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