Malicious PDF — malware analysis report

Static analysis result for SHA-256 2831d000a9213fa1…

MALICIOUS

PDF

70.5 KB Created: 2021-03-15 22:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12620b136aa91ebc4dfc69aa1a42d0ab SHA-1: 726ea3e98f2ba798c00974a376b02f364f5b4862 SHA-256: 2831d000a9213fa1d0321ed763998f97c6b86b980815a8cdbbcfc82b5f03855e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=how+to+trade+in+webull PDF link annotation
    • https://judikojegewag.weebly.com/uploads/1/3/4/5/134583508/176192.pdfIn PDF document text
    • http://boost-store.net/lara_croft_relic_run_mod_unlimited_money1cirq.pdfIn PDF document text
    • http://santaparker.store/arbre_gnalogique_des_rougon_macquart_analysesx58v.pdfIn PDF document text
    • http://afracheat6.xyz/moziw367vb.pdfIn PDF document text
    • http://hytri.com/singular_and_plural_nouns_worksheets_grade_62a0hk.pdfIn PDF document text
    • http://lewuvajenajen.iblogger.org/5845587293.pdfIn PDF document text
    • http://monanuzusud.22web.org/formal_letter_template.pdfIn PDF document text
    • http://vefavirona.22web.org/several_supreme_court_decisions_have_been_overturned_by_the_president_of_the_united_states.pdfIn PDF document text
    • http://spainsale.pro/nonily4ceo.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/79709724475yhjrp.pdfIn PDF document text
    • http://shopsupergood.site/pemurivewelofofatawaavv74.pdfIn PDF document text
    • http://bbflowers.net/aus_tv_guide_sunday0o1t7.pdfIn PDF document text
    • http://english-10.site/didapzp5gj.pdfIn PDF document text
    • http://oneshops.space/chernobyl_fire_mapsg2dva.pdfIn PDF document text
    • http://idealslimitaly.site/porque_sale_linea_negra_en_el_embarazod18e5.pdfIn PDF document text
    • https://zizovotitimojuv.weebly.com/uploads/1/3/2/7/132712514/gexekaxizomigeso.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/69372.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/zabejuvijolu/13536192646.pdfIn PDF document text
    • http://wokesoz.epizy.com/172883220.pdfIn PDF document text
    • http://degeluvugo.rf.gd/dizexeboliwejusat.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/xepozinizijabem.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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 4836 bytes
SHA-256: 16f52d43fb92677e3d62573c523104fc4e7fd335a4e093d844890a5affe3b921
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 10540 bytes
SHA-256: d53a601548c6a759053e4265b060c303aabbc6a8cbc73415bfb7855ad091e1c1

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