Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e90ac9f285c616…

MALICIOUS

PDF

71.9 KB Created: 2021-04-09 11:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a9d438698c33f18f0bf0362132bafdb SHA-1: 945b90078cefc8d9baf6a0f50b4c2e069052bd5e SHA-256: 99e90ac9f285c61627fce530d7ceb54ec93bbb262ff5eada4836d7482325a2e0
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=11.1+specific+heat+worksheet+answers PDF link annotation
    • http://henrysavbr.site/free_download_action_movies_2020_full_movie_englishl5657.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/vocabulary_workshop_level_b_unit_5_synonyms_and_antonyms_answers.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/57601918804w17l0.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/46513748962.pdfIn PDF document text
    • http://winoorama.fun/salary_of_aircraft_maintenance_technicianhf6nm.pdfIn PDF document text
    • http://trokot-shopnew.online/gasovigufoliropojepaza30lzm.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/important_days_in_malayalam_download.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/64167218531.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/fa949214-9d4c-4bdd-b3ab-24e01b0d387e/nurefaxedelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814c62b2-f3c6-444b-9cd5-8ac16f148465/how_to_clear_error_state_on_canon_printer.pdfIn PDF document text
    • http://kuzoxutinilidog.rf.gd/56251067757.pdfIn PDF document text
    • http://jipuzekas.rf.gd/jozatowopaduwotom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce8d71d-1790-409b-acb2-a3780ac2c8f9/what_does_the_salvation_army_believe_about_the_eucharist.pdfIn PDF document text
    • http://pewazeje.rf.gd/fanepopanogijowax.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_082c96e9b32c4e779ce5af7e86ebc86a.pdf?index=trueIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_9de408fef1154181af13fac357c99bca.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_a653681cea5e413ebbb3ba8518765bfb.pdf?index=trueIn PDF document text
    • http://furafep.onlinewebshop.net/cancer_de_estomago_signos_y_sintomas.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_36a589a78ed0463a954239bd5a992de5.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_d22c7354de1d4e25a8d538e616e5bf0c.pdf?index=trueIn PDF document text
    • http://vakakumiwizexoj.epizy.com/minstrel_boy_sheet_music_bagpipes.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/broadsheet_newspapers_uk.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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 5216 bytes
SHA-256: 195ff8beb4e6fc57d450a3f10ab2e42a3488512448640738d9bebd902febd595
font_01_sfnt_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 10804 bytes
SHA-256: d56dbf0e32184976815b551a102d703c2f4abfaa10435a6a335db649309806a4

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