Malicious PDF — malware analysis report

Static analysis result for SHA-256 183770306275aef4…

MALICIOUS

PDF

68.6 KB Created: 2021-03-25 08:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 461fac0fc342c7a35f60395b52786afb SHA-1: 281ba610b7265702cf69818b4b6128082131bef6 SHA-256: 183770306275aef41729ce44ba912650b326ab77e77bb98abbc6c6bc9c20ea1d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary external URI pointing to 'https://vilenefex.ru/wix?keyword=night+anticipation+guide+answers'. The document body, though heavily obfuscated, suggests a lure related to 'night anticipation guide answers'. The presence of multiple disposable hosting links further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=night+anticipation+guide+answers PDF link annotation
    • https://cdn.sqhk.co/norumuwapa/Lfijnia/border_patrol_checkpoints_phoenix_to_san_diego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_6023d1db9c76e.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/gj3gfgj/kangourou_maths_2009_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451348/normal_5fe294e18b206.pdfIn PDF document text
    • http://kenujuzuba.22web.org/bewulaseliruvomexuva.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/autismo_e_incluso_livro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_603363e886316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5ff1f259c100e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5ffd38adeba7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_603542f038764.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/31282793564.pdfIn PDF document text
    • http://vekowen.getenjoyment.net/goduxonato.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/90627592460.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/gdcAThf/1994194915.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/kaby_lake_undervolting_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5fe5a2c302806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://murarefap.epizy.com/84032254217.pdfIn PDF document text
    • http://fuzuwami.epizy.com/gcse_maths_past_papers_with_answers_edexcel.pdfIn PDF document text
    • http://sujotoginejo.rf.gd/tegofilabozanuxat.pdfIn PDF document text
    • http://muparokaxewidad.rf.gd/xakafejakubupaga.pdfIn PDF document text
    • http://mowixir.epizy.com/agnes_martin_lugand_gratuit.pdfIn PDF document text
    • http://lerumedinopox.onlinewebshop.net/29798022231.pdfIn PDF document text
    • http://jibogifimot.epizy.com/wondershare_filmora_8_for_pc.pdfIn PDF document text
    • http://gegenig.epizy.com/guide_to_effective_instruction_math_k-_3.pdfIn PDF document text
    • http://livutogugusal.rf.gd/61909316005.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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 5364 bytes
SHA-256: dcc18fb7eeb31409d7142994d2851d06d728ed00421cd7ac44dfb1ed92af3f32
font_01_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 10544 bytes
SHA-256: fb4a873342ccf94e8cd416cff298e13dfc7752a5d648d859148b61584793cbea