Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da81e2f954a5f4f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-06 12:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b28a21bb220443dd2ae409926045ccfb SHA-1: 2abe1977b787c6bc159e3a76997cbdb38f39199a SHA-256: 1da81e2f954a5f4fb072b8bd8ecb08b65b539f146010a2b39d1a5d7f047bcaa7
186 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with heuristics indicating a link farm and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=hatchet+by+gary+paulsen+chapter+13 PDF link annotation
    • http://hookup154.space/victory_in_spiritual_warfare_tony_evans_dvdcreeo.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/fojuzelikovini-nimunofitutuxex-rufef-mivezen.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/vifinuwifizojerubot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fdbcf4c78db6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5fff963eb1cfa.pdfIn PDF document text
    • http://dodunagosukew.iblogger.org/3_major_landforms_in_china.pdfIn PDF document text
    • http://itasda.online/how_to_turn_on_jenn_air_induction_cooktopu4kt3.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/fefolilazujewi-refubekupax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5ffd643f9baa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_6011af1a980c1.pdfIn PDF document text
    • http://wunutomerar.iblogger.org/71453943709.pdfIn PDF document text
    • https://fanamiwa.weebly.com/uploads/1/3/4/0/134013174/kezusigisajokolip.pdfIn PDF document text
    • http://dugules.iblogger.org/65266905811.pdfIn PDF document text
    • http://xekaminam.22web.org/how_to_create_a_heros_journey.pdfIn PDF document text
    • https://pesaladijij.weebly.com/uploads/1/3/1/3/131382382/73ca2.pdfIn PDF document text
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/1650422.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/vikilimi.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/7e03554f40b1f.pdfIn PDF document text
    • https://marutonekuposew.weebly.com/uploads/1/3/1/6/131606360/lurora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5fdafc5a601ad.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/how_to_find_my_wps_pin_for_printerwuvkl.pdfIn PDF document text
    • http://pinegrvuig.fun/space_free_phone_wallpapers_androidjpz1p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/jibigowejubexafisudebo.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/15912897997.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/88297940940.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/escala_de_barthel_modificada_portugal.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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5616 bytes
SHA-256: ef74b89ca07cbbb4837bf9abb8c73883b7688421b5bf60135e6e2039e0c435f9
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 10296 bytes
SHA-256: 024248a68cd8fe7c307718bf1a09016abcd4bb6f1f332967fb90c251ff08e2be