Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1a76ca7ad87ea8…

MALICIOUS

PDF

79.1 KB Created: 2021-03-21 05:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e9b3fcf99b961ab48ff55b39975633d SHA-1: 91f29c4d9cf73bea5c0f564f5f1fc4da229f9e94 SHA-256: 0b1a76ca7ad87ea88c7226316b95fd64ed0e546b8d9b8e585ea4ba005d143023
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://dugedepap.ru/strik?utm_term=harry+potter+illuminating+wand+noble+collection PDF link annotation
    • http://fomilexavekol.22web.org/microbrewery_business_plan_template_uk.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/advanced_english_stories.pdfIn PDF document text
    • http://torixobo.mypressonline.com/up_budget_2020_in_english.pdfIn PDF document text
    • http://nezumogeto.iblogger.org/80779011219.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/zinejimaz.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/why_does_my_honeywell_fan_keep_turning_off.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/zofotejujunep.pdfIn PDF document text
    • http://degimogug.mypressonline.com/balsam_peru_castor_oil_davis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a3555e-d1ed-4225-bb55-ea102855e01b/leziwofedalodilotekufabuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c40b24-158f-4750-bf09-763efd73db70/energy_kinetics_system_2000_manual.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/articles_worksheet.pdfIn PDF document text
    • http://fuvuxejuv.myartsonline.com/rewilamosurulaxam.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_ff3abfc363ad4abf99af57d5564c7188.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f872b8d6-52cf-405a-aa8c-7c3515cd7016/reset_toner_counter_brother_hl-6180dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa883ae-0d56-468e-9067-47d216b87717/gizagulukizoram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c82fce3-2d66-4b6a-8184-a4bc88725ca8/61683351394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5ad5a2-7686-4fa5-9b0a-e5a3f48ed1ad/46549258628.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_01a0b15666154672ba333ef1ceb41f7a.pdf?index=trueIn PDF document text
    • http://jizuwugi.rf.gd/84882095761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a3d3b7-7f94-4ceb-806b-731c800f29e2/how_to_use_iphone_as_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec0662d-1e42-4ea7-a7bd-d568a6b320f6/craftsman_46cc_backpack_blower_gas_mixture.pdfIn PDF document text
    • http://widafasamuj.epizy.com/63966042376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09939d57-2674-416f-bedb-58ab07a51323/re_zero_light_novel_volume_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba12da6-942a-4dfe-9b7b-78715f6b9533/72363108134.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_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 5508 bytes
SHA-256: 4d5ff51644f3903723d3af65bac2f90c7ddbb1f454992c808904c1a0d8c62097
font_01_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 11468 bytes
SHA-256: 9d43fcc024b65b7bdaa222afe10f5d7c27c0dcdcd159b8971f205fa7dd835d43