Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8158d116305c2b8…

MALICIOUS

PDF

77.4 KB Created: 2021-05-14 15:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 59dd47653c38e7f2abd522f5044a51c1 SHA-1: de0cb713d7d1a4a4df3665965b110758798ee73c SHA-256: c8158d116305c2b85a2070be649c57c0e214cf675c99c1b95b54b625a5ee14f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=toto+washlet+c200+filter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=toto+washlet+c200+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387241/normal_60543f45a2a81.pdfIn PDF document text
    • http://maxist.ru/dunkin_donuts_couponsw6gjv.pdfIn PDF document text
    • http://pusosokus.iblogger.org/ternary_ionic_compounds_worksheet_answer_key.pdfIn PDF document text
    • http://wide-mean.top/80477737160njc55.pdfIn PDF document text
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/3187456.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/1874816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_602430de38b43.pdfIn PDF document text
    • http://spainwow.pro/bemegupamogoferitotebdrjh4.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/litexemasafoxep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_606ea337910a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6037fb585aff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_604eafe4ee6cb.pdfIn PDF document text
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/gavij_moturara_tivum.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472188/normal_5fef1135aa192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funurebebepoti.epizy.com/quartz_westminster_chime_clock_instructions.pdfIn PDF document text
    • http://fimibujoreza.epizy.com/toxel.pdfIn PDF document text
    • http://bixezuguvibubu.epizy.com/mecanismo_de_ao_dos_barbituricos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8397d6a-31ab-4f2e-96cd-09eefcea19ec/past_simple_and_past_continuous_exercises_3o_eso_with_answers.pdfIn PDF document text
    • http://zujabazu.epizy.com/37190558450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abcd404-49fa-46bc-a772-4d51a1810592/second_hand_110cc_pit_bikes_for_sale_cheap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c659bb8d-749b-4a88-a75b-37f7d66bbf76/79167554006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57976ce1-b4cb-486a-aee5-de2a50a5b621/how_much_does_it_cost_to_install_a_heater_in_a_garage.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_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 5284 bytes
SHA-256: 31710500f3659cd7887a14e6e2f9c21ef6e15953fb29fd0400ad094326f8173b
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 11504 bytes
SHA-256: 3004bd3ee3da20e6490719f4c18557ed3cda12b7ccd84079bf47274d5376df5e

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