Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b87455807ae478…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 10:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c5c3d4babad8783f0cab65568294de2 SHA-1: 746453cdf190a723a58598f6d5e4fe549f3b14e3 SHA-256: 67b87455807ae478665c80a8bec13846a619d75db2f091a95193e390a62a7835
186 Risk Score

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 0.9991

Heuristics 6

  • 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.
  • 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://ponafet.ru/wix?keyword=ams+broadcast+conference+2020 PDF link annotation
    • https://cdn.sqhk.co/pajerelo/ZhjEpzS/winkbed_luxury_firm_vs_soft.pdfIn PDF document text
    • https://mevidumufodu.weebly.com/uploads/1/3/2/3/132303219/dc04f1.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/jej2u8i/fivoravusowukukesu.pdfIn PDF document text
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/gejas.pdfIn PDF document text
    • https://vawalebadafi.weebly.com/uploads/1/3/4/6/134660315/xidibegidemupodosu.pdfIn PDF document text
    • http://golixudib.mypressonline.com/benim_hocam_ders_notlar_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/bpgihVN/66570606935.pdfIn PDF document text
    • https://cdn.sqhk.co/madobeborozu/iigqhXV/top_100_station_radio_frequenz.pdfIn PDF document text
    • https://cdn.sqhk.co/nukebomevobe/1k1ighi/deduropubag.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/0M6hdmo/12685085091.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/6631893.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/92305859138.pdfIn PDF document text
    • https://cdn.sqhk.co/fononedegot/YexhhhI/selezeturodisakej.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/apipdam/cat_ears_and_tail.pdfIn PDF document text
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/bopawopegekirok-wowuful-sevijufelobasaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/id7qgcE/messenger_download_for_android_4._4._4.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/search_scanned_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/UUhdggv/90449399232.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/eUtb519/stack_switch_lowes.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/jigMSje/consignment_invoice_template_excel.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/zurovajij/math_practice_worksheets_12th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/tractor_supply_4health_performance_dog_food.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/bizupezuxifimudu.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/puerto_rican_rice_recipe_sazon.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/how_to_factory_reset_from_cmd.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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5540 bytes
SHA-256: 456af8649718fb3f6097e840bcfe0a5defee89609449f9467664721c352340a7
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 11252 bytes
SHA-256: 125c485240ae12e175a6303e7dfd498a3950b2665d60c697aef25ae9c10b731c