Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b039708926c71f4…

MALICIOUS

PDF

107.6 KB Created: 2021-03-12 15:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 25767118d45aa228fdbcd850b4402ba2 SHA-1: 58fb2e05c326733a791d4cdd6258b076280a5961 SHA-256: 8b039708926c71f4fecfbf2794cb9a276227785271bd4fde7a2d286f7446bb52
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=is+there+a+grace+period+for+expired+driver+license+in+massachusetts PDF link annotation
    • http://pexarinolal.mypressonline.com/lp_anemia_2020.pdfIn PDF document text
    • https://vaxidavuk.weebly.com/uploads/1/3/4/3/134371973/2652744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_601211df6c9b9.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/a13b9e1d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451369/normal_5ffdb7cfba135.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/85734.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/38269146215.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/72048549339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_60464d384f64e.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/what_to_the_slave_is_the_fourth_of_july_purpose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_604145aed8897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424378/normal_5feed9697305c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fe295a732570.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/nKahdhd/2699023024.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/cKjdggz/car_loan_calculator_pakistan.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/canon_powershot_sx700_hs_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_601876281866a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_795f9006ef5f47e987918cd6f2d89d18.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_a3629390e59e42339c7ae03934e0160e.pdf?index=trueIn 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_off00016a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4F 5632 bytes
SHA-256: b1a1072dfb821edeaea51bf52c0d18650782a3fe1d4e39a2c3ffddaf1961992f
font_01_sfnt_off00017d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5E 10248 bytes
SHA-256: 113b01919bbdb795204ce13e39166086826af9a68dc3785a11a2f1ad685460ef

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