Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af0da20920e51c3…

MALICIOUS

PDF

84.2 KB Created: 2021-02-13 06:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c680ae755c57b793677a9dd5e76ccc3e SHA-1: 8caa660cd8da09011e4ae89d5751877a553e0ce4 SHA-256: 1af0da20920e51c3f21d1bc700cf8557d6b96dafdf7a0bc05c67a6363c702d87
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book titles or search results, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially malicious content.

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 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.
  • 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://baarspo.ru/123?utm_term=dean+koontz+frankenstein+book+4 PDF link annotation
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/sazasebamafijorakiwe.pdfIn PDF document text
    • http://c-advance.space/estructuras_de_la_mente_howard_gardnapmbr.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/woweg.pdfIn PDF document text
    • http://exampl1214.com/rupomifisasekudopazitukdj3xs.pdfIn PDF document text
    • http://spain50off.info/-ne7v3.pdfIn PDF document text
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/moxiza.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/7941343.pdfIn PDF document text
    • http://autoport76.online/6413961606b2mzx.pdfIn PDF document text
    • http://wopedejani.iblogger.org/anatomy_book_for_nursing_students.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_600a5fb2dfedb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/goviwigax/equifax_canada_credit_report_and_score.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/solubility_curve_worksheet_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/jakukekuvunikefigapeb.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/yahoo_mail_to_outlook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 4860 bytes
SHA-256: c216f4b7fa8a66721addc9dc5307487974903e67d524c1959634c0d840f6d0f1
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 12928 bytes
SHA-256: f0861c9b65597215729d988d7284cc57b47efc2bfae89feb88cab58255c0050b
font_02_sfnt_off00013538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13538 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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