Malicious PDF — malware analysis report

Static analysis result for SHA-256 879b6ce9d47e4d02…

MALICIOUS

PDF

68.8 KB Created: 2021-04-27 13:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a78b1aded37030e3b423f9020efaca3c SHA-1: 5a1744efcbc33b6fd904a3a29661390e39fad905 SHA-256: 879b6ce9d47e4d02d4631fc60491671aac99d24e2dc543fd44a0d8132dfb1b2c
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+to+reprogram+genie+intellicode+garage+door+keypad PDF link annotation
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/352752.pdfIn PDF document text
    • https://xuravamu.weebly.com/uploads/1/3/2/7/132740838/xezunalolasakig.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/7828576.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/lijakuki-gumuvajesu-xijiguxiz-basumuvidolozez.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/scratch_3._0_guide.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/how_to_insert_audio_track_in_garageband.pdfIn PDF document text
    • https://kibolimu.weebly.com/uploads/1/3/4/8/134872751/6435604.pdfIn PDF document text
    • https://pajotesose.weebly.com/uploads/1/3/2/6/132681045/vuxifigo_reloroxu_riruxitipa.pdfIn PDF document text
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/3486795.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/technical_drawing_with_engineering_graphics_download.pdfIn PDF document text
    • http://lasleymarkt.ru/washington_dc_newseum_hoursoqps9.pdfIn PDF document text
    • http://tiktokfrance.fun/pm_awas_yojana_online_form_2018tm131.pdfIn PDF document text
    • http://podarokinsta.online/rufugatalevivrhril.pdfIn PDF document text
    • http://giocodigital.fun/26702914567fhatj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baletax.onlinewebshop.net/fabirerizefodotekefuvog.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_61eb5b67466d4f7590aabbb8b89b5155.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83737448-f7d6-4ccd-a2d0-fd0443fe2a18/tutewajobojutusekoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6574b1c-2430-4bd4-a6a6-49067c0ae742/the_micro_economy_today_14th_edition_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ce002b-c909-498b-83f3-85905a84be0f/fomukunewapo.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_4d6c9caed1884f629638cb25d0342b3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39523102-1427-410e-a6cb-88acc23ae843/why_does_mint_duplicate_transactions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d87346c-a154-4f0e-9c8e-5c38713b4b50/remington_700_sps_tactical_308_barrel_length.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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 5432 bytes
SHA-256: 28cdd405c2dece43a9a56fea373a8ca95572a2bc1cf9b070c4cc0f8b669f7b84
font_01_sfnt_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 9300 bytes
SHA-256: e4adbc6eb3ef4d24c22992acda5f5f1789188c93d76b431fb4511720f5e6fb3f