Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a523884e3223faa…

MALICIOUS

PDF

76.5 KB Created: 2021-03-18 10:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e38bd69f11255acad09da0f27a4d790 SHA-1: 10eb9a464231c3507965df66071dff291324d982 SHA-256: 9a523884e3223faa0f2f87069cdab105e09a8df74fe53416ea69fe52296e5ef0
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 0.9995

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://botokaw.ru/123?utm_term=how+to+cite+online+pdf+harvard PDF link annotation
    • http://fortuneo.biz/the_lottery_summary_short_story0zoup.pdfIn PDF document text
    • http://sentytld.online/32735309011c5m2o.pdfIn PDF document text
    • https://musazejat.weebly.com/uploads/1/3/1/1/131164110/2251743.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/zusela-wetava-gafexe.pdfIn PDF document text
    • http://benikovumur.iblogger.org/que_es_una_composicin_escrita_ejemplos.pdfIn PDF document text
    • https://janepowowufevi.weebly.com/uploads/1/3/4/5/134506071/refevi_dododalap.pdfIn PDF document text
    • http://dmdmassage.com/21876933543m5zxd.pdfIn PDF document text
    • http://kunobalo.22web.org/92042931812.pdfIn PDF document text
    • http://woodbonus.net/atlas_craftsman_lathe_4_jaw_chucktg52a.pdfIn PDF document text
    • http://gekenig.mywebcommunity.org/wumeral.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/sajatofubote/line_6_pod_2.0_amp_models_list.pdfIn PDF document text
    • http://sigamit.epizy.com/pathogenic_bacteria_in_food.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/control_of_the_astral_body.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be0ce92-1cd3-4f2a-9287-ef9683824a8f/head_first_java_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/niwurejati.pdfIn PDF document text
    • http://pukupufiribeja.epizy.com/dozumewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8641017-94e2-4a37-bfe9-005a9624488b/how_to_reset_a_dewalt_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704fd02c-e495-46e3-8bda-28cfe025cb91/how_to_qualify_for_navy_federal_credit_union.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/wosotus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f5eaa5-c6de-46a9-96c7-cd91ca58d48d/kufirovopunejop.pdfIn PDF document text
    • http://pivotigapux.rf.gd/data_interpretation_and_logical_reasoning_book_for_cat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775c6216-51bf-4228-8282-b938e7149dd9/how_to_find_cherokee_roll_number.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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5180 bytes
SHA-256: ef8cd079263ab9431da1ed5ff66e4c104acaea5b287c2c560feccde79a7a61a3
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 11292 bytes
SHA-256: dc0daa8c1b24758a921109560408ba004c73f41c6ce325e3efeb2ac7e1ecb733

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