Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e562fa8f0c5a2a8…

MALICIOUS

PDF

78.5 KB Created: 2021-02-22 11:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f351aff5fb22182174f5358ac85c845a SHA-1: 29ba0a9cd64abe9c9ff19661020ae8accc01696b SHA-256: 7e562fa8f0c5a2a8a211de6a3137376c9a00ac07f5761d958a1112310b243284
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 pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://maypoin.ru/strik?utm_term=why+do+sinkholes+form+in+florida PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501998/normal_6015c98b6897f.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/5200164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_600fa4ae13fa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394073/normal_5fff7246abde0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd3869052e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463006/normal_600bf329bc177.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/784dc7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377706/normal_5fff28f665cff.pdfIn PDF document text
    • http://goworudubilit.iblogger.org/bantai_rap_song.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/silinuve_jadagevug_xoniz.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/6348724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_602b6eeac8af6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459162/normal_5fff64a07915c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417807/normal_5fcbb0bf319b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_6026238c3f459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_6026b944be107.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/dukofegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wewimolu.epizy.com/fibre_cement_roofing_sheets_for_sale.pdfIn PDF document text
    • http://tuvusekore.rf.gd/vigene.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 5328 bytes
SHA-256: 04d9be98fe644e1cdad190ed677f1a065f00ea94a0d47351b426c9cdc44796e5
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 11320 bytes
SHA-256: 7c524d2aa3d19d7f6d6d061d507085884ee0da65edaa3004a79b99eec43c2d8d

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