Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5ada1222af7dab…

MALICIOUS

PDF

104.4 KB Created: 2021-03-09 06:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 254975ec0a51ff7a045132daaa39d80d SHA-1: c6d29b825f315eb5b63cf5047977aaef2cb9617b SHA-256: 1b5ada1222af7dab5cdee89bbac0c79c9c072602909f2806b6c17dd5ea869b88
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to 'scientific method worksheet pdf answers', aiming to trick users into visiting these malicious URLs.

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://kuzutuzo.ru/123?utm_term=scientific+method+worksheet+pdf+answers PDF link annotation
    • https://xevusego.weebly.com/uploads/1/3/5/2/135295893/0da4d82.pdfIn PDF document text
    • http://trenketo.buzz/508872495041ypav.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/ec5511f47f.pdfIn PDF document text
    • http://pakijuzovukuw.22web.org/bissell_powerforce_helix_bagless_upright_vacuum_2191u_belt.pdfIn PDF document text
    • http://wuvilorilete.22web.org/investigator_brochure_template_medical_device.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/mufilogepenata.pdfIn PDF document text
    • http://xadebiwivupogof.iblogger.org/technical_evaluation_criteria_template.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/38712970240.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/7695328.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/dekelul-waluruwakad-valag.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/2134734.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/market_wise_ag_services_llc.pdfIn PDF document text
    • http://my-favshop.online/taluzebivonokotcuabp.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/xadika_roguzubal.pdfIn PDF document text
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/zevetufa-lixafinel.pdfIn PDF document text
    • http://saudiautoinsurance.com/how_to_recharge_prime_video_on_app9n0s6.pdfIn PDF document text
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/483898.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/zedudo/zeguteb.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/57518902548.pdfIn PDF document text
    • http://vitewunidamol.epizy.com/koxomuruwewalenado.pdfIn PDF document text
    • http://polabufu.myartsonline.com/50318270970.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_off00015ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE7 5620 bytes
SHA-256: e02237b51fc59beadae5052f620affbbe7895d8a0ee3ee71d52fbee8372333f9
font_01_sfnt_off00016df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF0 11244 bytes
SHA-256: 83b7c23b02b2f23c2ff3f1425d50d96721731715a16c9200cf118950f54eef4f

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