Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eded8ff701a1b1…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 19:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8fc6c57350b58692e86db8ffa15c4f72 SHA-1: 97ac6c8c2734d707acd8aaec63cb75e84670a85a SHA-256: 21eded8ff701a1b14fd9ba9eb4ad83ced091f084c0cf78c99abdef72ef132292
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://zajinet.ru/strik?utm_term=how+to+simplify+fractions+on+a+ti-84+plus+ce PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcb8ee48eefe.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/33hiPm9/jetakovuvepudusu.pdfIn PDF document text
    • http://wukijomenanop.iblogger.org/82558205659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5fdcae85eda72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369525/normal_5fc9271b58618.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxogugexi/3jjggeK/bestwap_bhojpuri_bhakti_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_604f80147338c.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/rhjBAsT/34650175020.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/f97aff4c-133d-4bec-a502-6c57075c74f1/tuwolonujonifi.pdfIn PDF document text
    • http://lavaraf.epizy.com/kasilof_river_alaska_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/crca_sheet_cost_per_kg.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/the_greatest_showman_all_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda64bcc-e741-4e0f-975a-2da83104f802/pijadum.pdfIn PDF document text
    • http://sasejas.epizy.com/best_sheet_mask_anti_aging.pdfIn PDF document text
    • http://suzufesa.epizy.com/bernal_diaz_del_castillo.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_337006545da84777bd450154200622bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7d9547-ed7a-413e-8c68-afd8bf8f86bc/club_car_onward_4_passenger_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/single_entry_bookkeeping_software_free.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_412be6b79ffd4432b3dfd121302c9f8b.pdf?index=trueIn PDF document text
    • http://xetobagog.rf.gd/sodevon.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_fee5ac1a1b524eb2bff4e3a987d6a16d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/apc_smart_ups_2200_battery_life.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/what_is_design_in_fashion.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_8079300d07554486bc2d8a1ad59cd199.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5628 bytes
SHA-256: 09b902793c9fbe75edb177230166c21026c85685f2a1a2dd7c8a10ef32f81792
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 11256 bytes
SHA-256: 3b6327f2a9d6166017f2991418c7a6fe46eaa321dd9bfba0284e61f0f0f19d58

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