Malicious PDF — malware analysis report

Static analysis result for SHA-256 774ff50b5d444061…

MALICIOUS

PDF

76.5 KB Created: 2021-05-01 21:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9873531781306ce13353e8440bf381ec SHA-1: 53686da1dc396ab055883f6625afce8852e0b829 SHA-256: 774ff50b5d44406190c996656330725e31125d3bc2f81ce169831aa6fa3ebebc
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 0.9997

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://golowaki.ru/strik?utm_term=how+can+i+turn+a+photo+into+a+painting PDF link annotation
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/589372.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/leladazolovij-guxiziz.pdfIn PDF document text
    • http://samozanyat.info/beechcraft_bonanza_a36_maintenance_manualo0cj6.pdfIn PDF document text
    • http://legiontry.online/7323050379607yic.pdfIn PDF document text
    • http://pubgucbayim.com/uc_browser_pc_softwarexwc16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_605f531455c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_6033448eda5dc.pdfIn PDF document text
    • http://ijmalan.xyz/51790562632dusoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_5fd7d1620e6b0.pdfIn PDF document text
    • https://xinawekasev.weebly.com/uploads/1/3/0/9/130969151/4718954.pdfIn PDF document text
    • http://startask.ru/hp_2013_ultraslim_docking_station_firmware_2020a2ba5.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/sefabe/how_to_get_staples_rewards_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f360ec-d0fc-45b0-a13b-39277ffe3564/daycare_employee_handbook_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/do_tomatoes_grow_all_year.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/earl_nightingale_lead_the_field_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/present_continuous_worksheet_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/how_to_reset_jetta_oil_change.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/alveoli_adjective_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eaa01a8-7b5f-4d2c-afc8-4a67e8aa1155/95498634445.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/jogivozi.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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 5036 bytes
SHA-256: 47640cddae1741c0866c347659e81bdcc4a1aa6e70c757e3cbf43df9bcb6c5e7
font_01_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 10660 bytes
SHA-256: a01bae445f273c4e307e5af2dbeac3062d5e5ad062866b276c141b87bf354da4

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