Malicious PDF — malware analysis report

Static analysis result for SHA-256 473ae7f7464072e0…

MALICIOUS

PDF

88.7 KB Created: 2021-03-07 10:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 080c96def97ad2f5ad09a7b59318a9dc SHA-1: 00be17f811b342facd61974ac60cd582ae4d6efd SHA-256: 473ae7f7464072e0059f52d146ee6badccf52841bb541d978a45d8d364ce3e37
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=revel+for+psychology+from+inquiry+to+understanding+4th+edition+pdf PDF link annotation
    • https://wilalupesakugos.weebly.com/uploads/1/3/4/2/134235894/jewoxutidebojajujo.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/mowab.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/hkgjgj1/13606668424.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/ggfKF6k/vomiting_causes_hypochloremic_alkalosis.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/hib86gi/98374927111.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/pjcXbPR/your_tv_guide_orange_dubbo.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/xurutupada_rixip_xesasixudeteje_norolabe.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/2918edd9e26.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/c8ohiyg/black_rifle_coffee_san_antonio_office.pdfIn PDF document text
    • https://guwifanifinib.weebly.com/uploads/1/3/2/7/132740319/mipegiposidavugepaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_2b370758c4ea4171a2c7472c44d0bdbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/edsby_report_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/kindergarten_math_worksheets_subtraction_with_pictures.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_57f81a6ab6ad42248dadab47f21a03d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/bifunitibexaded.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/81891725640.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/logarithms_and_exponents_questions_and_answers.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_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 5952 bytes
SHA-256: 480e1c3afaea7abee4fff22f8a4c5364d59e5a3fc65520e61b88259f2aa37356
font_01_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 11816 bytes
SHA-256: e2ec836dd2c9804af26470b340836937360cc9beb68c331c6ed795ab8f8b3bc1

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