Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83f3e40c5c9a705…

MALICIOUS

PDF

81.4 KB Created: 2021-03-10 12:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7611c9cbf9dd8efe75f6876fd2be829 SHA-1: 59ba089dfa50bb70b3f996aa8ed480acd2128e02 SHA-256: d83f3e40c5c9a7058e70cacd02ae23867973fe1172e2720c8ff1be700bdf6e45
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://vilenefex.ru/award?keyword=catcher+in+the+rye+pdf+chapter+22 PDF link annotation
    • http://tramlaweq.online/french_revolution_essayrdlug.pdfIn PDF document text
    • http://marketitaly.info/ice_cream_places_near_meuq7zd.pdfIn PDF document text
    • http://ridunculus.com/oxygen_concentrator_mechanism_of_actionh9hoj.pdfIn PDF document text
    • http://podarokinsta.online/android_sdk_unity_manualbefgi.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/replacement_parts_for_spalding_basketball_goalbj1l2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_ac1dd0c90de1421599ced6a6d1d9e321.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/data_analysis_excel_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf32d08-6b51-478a-be6b-96d22dfe5858/sidan.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/escape_room_game_level_146_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d89f21-b9cb-4520-9835-8c7858904235/hp_officejet_pro_l7590_price.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/relative_pronoun_exercise_for_class_4.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/simple_factorisation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1805c16-b71a-45ea-8f93-24daf40e9a83/how_much_does_it_cost_to_repair_a_riding_lawn_mower.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_6d895ac231ef45878391b0c20dd6d6b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6181ba-e47c-47d7-ba6c-e5e7fbe89380/interpretation_of_robert_frost_the_road_not_taken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec8fb87-9720-4221-ad3c-56e303f77252/how_to_code_thinkorswim.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_35bc4744581147b7b46ec364faf7abc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/how_to_be_a_medical_surgical_nurse.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/aws_firehose_lambda_transform.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/ceftazidime_avibactam_prescribing_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb2f206-bbff-4024-ab40-b9ce4af7a5bf/best_movie_maker_app_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/juxiroxegezuguxozokojub.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_967f095fbf7740299ba98c53190fbfcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f93f082-9cac-4542-912d-44b15d8117c7/bajipirakav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61359bcc-7205-4903-a132-f7676356d9a3/41271231871.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_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 5172 bytes
SHA-256: 6440dc8aca4c69b03abf0b989d87f91d9f8bef0a047008834fead8ec62be4d41
font_01_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 10588 bytes
SHA-256: 0a0ec38a15fcb0728410923556532cbe8893512a73253db17b997874277f23c8

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