Malicious PDF — malware analysis report

Static analysis result for SHA-256 8292f15123b2e67f…

MALICIOUS

PDF

71.1 KB Created: 2021-03-05 10:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: db0591ccb958d0cbc1d2cb59363517aa SHA-1: d75ec6db12ecc49cbc4fd14dc94c930d0ec063e8 SHA-256: 8292f15123b2e67f1b887f538953a1951ea1fd863cfa0584954cea03ec7de62f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing or trojan. It contains numerous external URIs, including a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body, though partially corrupted, contains keywords related to writing, likely a lure to disguise the malicious intent of redirecting users to the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=how+do+you+start+a+body+paragraph PDF link annotation
    • http://soluzixod.66ghz.com/arveja_verde_informacion_nutricional.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_601dad008e048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5ff1ce99a5ff5.pdfIn PDF document text
    • http://trastenmyqort.online/quantitative_aptitude_questions_for_bank_po_examgen4a.pdfIn PDF document text
    • http://reduslim-italia.website/hello_kitty_cafe_truck_pittsburghqmatu.pdfIn PDF document text
    • http://saburogamo.iblogger.org/75591309683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_603aaf336b460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_6037413969a90.pdfIn PDF document text
    • http://reduslimitalia.site/transport_processes_and_separation_process_principles_fifth_edition_solution_manualag342.pdfIn PDF document text
    • http://zuvels.xyz/top_robotics_companies_in_pittsburgh1fcu7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413697/normal_5ff033cf3d59d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawaduxivibono.epizy.com/free_autotune_software_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/creditors_turnover_ratio.pdfIn PDF document text
    • http://gugawabizex.epizy.com/is_the_planet_fitness_black_card_a_contract.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/modifuwam.pdfIn PDF document text
    • http://bapomel.epizy.com/nanigekano.pdfIn PDF document text
    • http://nenutufap.epizy.com/66654514971.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 5484 bytes
SHA-256: e00cf8468925f9e5b2cf13b7b539aaeae961eebdc57189310fe418d6d8932f26
font_01_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 10060 bytes
SHA-256: 5ca38b22d1b5a142659bf1d42134cb62c507c40dec7cdc8595a3dde4d7105190

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