Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94255f7d8be5319…

MALICIOUS

PDF

82.1 KB Created: 2021-04-09 05:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c13002691efd192314607c98b3ac1a82 SHA-1: 4296a161773af54d46fe9ebdb8a3d42ad8a645f7 SHA-256: b94255f7d8be5319112109d32fc4d4e0c110c86178b655e3035f5dbf692ee5cd
156 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 0.9993

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 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.
  • 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://pelibifir.ru/strik?utm_term=delta+portable+table+saw+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450419/normal_6040f257941b1.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/meteorological_instruments_and_their_uses_introduction.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_600061b85b985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5fe499f551bcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_6032907613035.pdfIn PDF document text
    • https://nufusuninad.weebly.com/uploads/1/3/4/6/134609023/722f99d8.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/zeburugadolemuzubib.pdfIn PDF document text
    • https://natugivekoxatan.weebly.com/uploads/1/3/1/3/131380011/wonusumowepozor_gujatulex_fanoxudi_xuwoleduwarezok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fdef25f610c5.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/57b612.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/vufazunakojajev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/funny_maths_questions_and_answers_sms.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/siemens_automatic_voltage_regulator.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/43576044170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9dfba58-eab1-4139-9cd7-79f461ebedb8/how_to_grind_valve_seats_with_stones.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/interoffice_memorandum_of_law_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81eed989-f69c-477d-8dd9-7a88a65c1584/wolalexe.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/careem_captain_app_free.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/layla_candra_malik.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/tactical_rpg_card_games_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/how_do_you_reset_a_bosch_silence_plus_44_dba.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/getolatezelipamasusuwukep.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/age_of_empires_definitive_edition_civilizations_guide.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_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 5104 bytes
SHA-256: da031f41815a531b5ad0fc785fee4ebd109b49e0234cfee2f94c14383c7552c0
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 10644 bytes
SHA-256: ffbcb24973b948d3334b820cbd14b1991261bcd5a26821201122a8890cc4b05f

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