Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a3b54504255e68…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 01:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d3a6a16326c6fbcfe674638fddcd8068 SHA-1: d12019bce19cfb567d19dec9e8683d37431fcd90 SHA-256: c9a3b54504255e680fb950fd7008c89b9dc6a8d41068135da4f11a73029c150b
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/pbw?utm_term=ejercicios+de+razonamiento+logico+matematico+resueltos+pdf PDF link annotation
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/60c9bbd5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_603346dd7d4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_6015b9f3e3183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_60409e866271a.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/xaketego.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5ff0b1431e94c.pdfIn PDF document text
    • https://bagukewedofitaf.weebly.com/uploads/1/3/4/5/134507185/fa0dd4ef.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/dedunates-tumemuzipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_6069338ee81e7.pdfIn PDF document text
    • https://turuposuka.weebly.com/uploads/1/3/5/4/135400354/1378237.pdfIn PDF document text
    • https://fulinufifirop.weebly.com/uploads/1/3/4/6/134656376/jawakujuwut_pexajesek.pdfIn PDF document text
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/3d6369b194eee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lezakoliz.pbworks.com/w/file/fetch/144597234/10349717285.pdfIn PDF document text
    • http://pijipusap.pbworks.com/w/file/fetch/144620745/what_is_solution_focused_brief_therapy_used_for.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/descargar_emulador_de_xbox_360_para_pc_full_espaol.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/64251168523.pdfIn PDF document text
    • http://pibadaro.pbworks.com/w/file/fetch/144582834/flip_professional_2.4.9.39_serial_number.pdfIn PDF document text
    • http://pifiloxema.pbworks.com/f/what_are_the_odds_of_getting_a_29_hand_in_cribbage.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/f/34523365871.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427422/o_poder_est_dentro_de_voc_louise_hay.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/ohio_child_support_calculator_50_50_custody.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/f/star_trek_technical_manual_online.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/w/file/fetch/144444402/59698300808.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/kereneguzebuwu.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/puwerigegu.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144431751/zirexizudugizevod.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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 5560 bytes
SHA-256: b9df5751eae4aca11c583220c04b59d838f0339b6cffa3bd73b6cd25143dea13
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 11912 bytes
SHA-256: de4e60be0f822b9c7da98fe3bbefc5982a135269e34bb706961e736645e14ee3