Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8aff97db80ae109…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 09:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 11f3c13778f725b71f3ba7754f3fd1cf SHA-1: a2a1eb69799bf96514a81fd9ad29669b90976c76 SHA-256: b8aff97db80ae1098524f7e37f5e1f56287fa3d211601ce9be599d9947bb8eda
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary URL, 'https://seumenha.ru/strik?utm_term=que+produce+el+sangrado+de+nariz+en+ni%25C3%25B1os', is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=que+produce+el+sangrado+de+nariz+en+ni%25C3%25B1os PDF link annotation
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/zorazejurudo.pdfIn PDF document text
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/638550.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/ammonio_saccas.pdfIn PDF document text
    • https://wijugiretatito.weebly.com/uploads/1/3/2/8/132814958/gurugugekum.pdfIn PDF document text
    • http://cafechorsu.ru/renonatuxuvigakosanjn32s.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/17465f8b4963f.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/PjdUdMX/937243284.pdfIn PDF document text
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/buvilulu_nugulujanora.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/bidHjiU/sin_pin_numero_para_llamar.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/Qgcjeie/balls_barber_shop_brooklyn_ny.pdfIn PDF document text
    • http://grandov.pro/88268631165ommqj.pdfIn PDF document text
    • https://cdn.sqhk.co/sivumazudi/cLgjEsV/25488206745.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/41437828668.pdfIn PDF document text
    • http://fringigejy.site/kofimolekuturawuzuvba425.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_f4d3d8d1348c448b93d0d2a9fc329f8d.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_aba49c97a11a4b6da40be57571631acc.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_aee8596788f74d8099cf826f27f00b34.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_c05b8b4ff6f146918faf5cd743f46299.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_72daa39bfc1042988dc6bcbb12bf4db6.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_88adc160874947f49feaacd1392bcbb6.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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5564 bytes
SHA-256: 6e810983654ee80f1215be7a646e2db25b8c16e6e37636412b84488dee263ff9
font_01_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 11580 bytes
SHA-256: 9a5488e31ddf693ce715e8e6a566003fa51eaa08a2a1b343b22a6514d61896f2

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