Malicious PDF — malware analysis report

Static analysis result for SHA-256 80be24c702d15a4b…

MALICIOUS

PDF

71.7 KB Created: 2021-06-05 13:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 62448ece7b44c976bd578280b7df0935 SHA-1: 227b674389cfdf38a7408570197f117436ac1b00 SHA-256: 80be24c702d15a4bc90608aff9d32c370cddbfbc65cf9d9eb17456f25ae4e7a6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though corrupted, contains text related to 'breeding guide' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the links. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/pbw?utm_term=complete+breeding+guide+for+my+singing+monsters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413119/normal_60544f9437241.pdfIn PDF document text
    • https://wasefopepaseb.weebly.com/uploads/1/3/1/8/131856398/16b64f0e3.pdfIn PDF document text
    • https://kibivatefa.weebly.com/uploads/1/3/4/2/134266698/04e710470a04f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_600eb11840da1.pdfIn PDF document text
    • https://zumugerajezu.weebly.com/uploads/1/3/1/1/131163828/gezepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_605ef77472e21.pdfIn PDF document text
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/a25e275e88843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_60548009437b9.pdfIn PDF document text
    • https://zefowuji.weebly.com/uploads/1/3/4/0/134096403/7665462.pdfIn PDF document text
    • https://donoreto.weebly.com/uploads/1/3/0/9/130969624/gapewiselukela_lurujemuzavu_damaji_puroxifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_60bb44959ee9c.pdfIn PDF document text
    • https://xixotileko.weebly.com/uploads/1/3/4/0/134018517/4651644.pdfIn PDF document text
    • https://fitovaturi.weebly.com/uploads/1/3/4/3/134371738/8822693.pdfIn PDF document text
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/tagenuridudomofutag.pdfIn PDF document text
    • https://gexokatex.weebly.com/uploads/1/3/5/9/135960098/18d9f.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/1daf92fb-59cd-432b-a0de-8bd78d44bdee/how_to_describe_rain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a59eb0-1495-4a3f-9368-13f5bd61772d/kitimugofalovakix.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/bobofolebinivoj.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/propiedades_fisicas_y_quimicas_de_compuestos_metalicos.pdfIn PDF document text
    • http://goxeguj.pbworks.com/w/file/fetch/144643842/schema_electrique_peugeot_partner_tepee_ii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce6ac7f-a7a1-4cba-a674-f24ae5c2244e/dragon_ball_z_budokai_tenkaichi_3_pcsx2_best_settings.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/la_divina_comedia_resumen_por_cantos.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144532329/levidajanabufofotutabaja.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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 5296 bytes
SHA-256: 934beae9e98accf1fc67d7374feddf1c13571b1043ce06c42daa5cb602bf71c9
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 10628 bytes
SHA-256: 8e09fbddf6529b4c923ab765555197d6a6f39aac50792ea1603f4bb45f38d2b1