Malicious PDF — malware analysis report

Static analysis result for SHA-256 793cb3ef32a632be…

MALICIOUS

PDF

86.0 KB Created: 2021-03-16 10:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0a9930a5c7790e8fa96d3bb8b76a3209 SHA-1: 1a2bc074f1f6349fa1d4e3c7cf016563e6cc8edb SHA-256: 793cb3ef32a632bef998fcf236fce8c76d939efdfa3f5066eae96b242a003009
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 0.9995

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://botokaw.ru/strik?utm_term=welding+supervisor+interview+questions+and+answers PDF link annotation
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/nopiwamoxumazovi.pdfIn PDF document text
    • https://natapuwofase.weebly.com/uploads/1/3/1/8/131857101/nuruvepigene.pdfIn PDF document text
    • https://bijigixeze.weebly.com/uploads/1/3/0/7/130739450/797b8c2d04f008.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/hghyhfg/best_buy_near_me_laptops.pdfIn PDF document text
    • https://cdn.sqhk.co/luvafuza/UCWOjjt/strapless_corset_formal_dress.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/3826109.pdfIn PDF document text
    • https://mutefalififide.weebly.com/uploads/1/3/1/3/131383766/fetefevesaduzeje.pdfIn PDF document text
    • http://frasqen.online/fisher_paykel_dryer_repair_manualie4n6.pdfIn PDF document text
    • http://idealica-italiauficiale.website/bachelor_thesis_thema_formulierenbh2ur.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/jiCvhgg/56322662560.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/8Uhd2hi/waxapivigukuwija.pdfIn PDF document text
    • https://cdn.sqhk.co/parapirer/jvPifji/my_ipad_calendar_events_are_gone.pdfIn PDF document text
    • http://hellovendi.com/mebinemuxejotalusoxawugupfed0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_67a76130b1834d4cbf375f2e5f93671f.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_6c347740b515414980ea90f5f11e145b.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_828e0763df0e46d6a68462f07c7b87a4.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_3efdc1463091497192b1c9efadfa3292.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_ef57b34624f249d09e88fb778572b1f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/future_tense_french_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/toniwoxolije.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_b3afc909b6474f1cae60f7f11ce69dc4.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_86b2c861c04849e0b92fe02348050498.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 5300 bytes
SHA-256: 091fe514088df6f2d83d3278b31bc5096d4e81fc2b5f483a3a7aab6de13ea174
font_01_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 10680 bytes
SHA-256: 9f1c63e4cc16fe7b377428a01a10100efd74cf52eefa8967132d54478b639fa9
font_02_sfnt_off00013d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f