Malicious PDF — malware analysis report

Static analysis result for SHA-256 e319325a070a899f…

MALICIOUS

PDF

70.8 KB Created: 2021-02-25 18:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54390dd47ea57a258c42f5f7db8cf608 SHA-1: 8588870f9793b3658ce12bedb0f8b7cc772dbbc6 SHA-256: e319325a070a899f1eec7c8d211714933913f70b9fbf824cec3dc25717a6f4d2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=ways+of+reading+an+anthology+for+writers+11th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420030/normal_600a1d7d90410.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/lojuvofetimoxelakoji.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/9892502687.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/3fcc0ace8ed.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/what_does_chrysanthemum_look_like.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/giijgia/snake_oil_salesman_synonym.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fe19a8017499.pdfIn PDF document text
    • https://netiwililisal.weebly.com/uploads/1/3/5/3/135398280/babowudexet-wabiga-jusuzedikagi.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/zafijukopa/88771807343.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/52148373131.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/accidents_reported_today_in_augusta_ga.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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 5564 bytes
SHA-256: 0c55e36f247847f339e0500ea0dcd45389a4695d0fefbd6445f416c430258b9d
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 11312 bytes
SHA-256: 0153b5714b6e46d9acc5b8c3f4701dc06f19b5c9f99b3f8e5691fd1b0070e2c6

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