Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7919eba576d500f…

MALICIOUS

PDF

77.9 KB Created: 2021-04-25 14:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 93179cf3bb904eb5c330a3ed0b6c8e36 SHA-1: 3f1e87a1ca16c3449fad1606605dadf2c1869ff4 SHA-256: d7919eba576d500f1778c65ab9b67ce27ed1439a61597b507194b25b52dbba99
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 domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=the+unbearable+lightness+of+being+meaning PDF link annotation
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/728679a52.pdfIn PDF document text
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/6d7369e0a007.pdfIn PDF document text
    • http://all-gopro.com/7977321493762f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_602f7dbbc1751.pdfIn PDF document text
    • http://rating-bookmaker.ru/nulipomawm99if.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/xitap.pdfIn PDF document text
    • http://centerverifybadge.com/724863974751tx7y.pdfIn PDF document text
    • http://civiliscmq.online/pagudagusawafaronopopewxfi7o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_602c744f1d4c4.pdfIn PDF document text
    • http://midumadataresut.66ghz.com/any_video_converter_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_600b8e361ed9b.pdfIn PDF document text
    • http://deweretiwusoxo.22web.org/types_of_international_business_strategies.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/ibps_po_online_application_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_8731c39e902945cb9b4dbaba49552906.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_07437a12b9244389a9aa7213303b231b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fed6a9-7189-4705-afde-149863b36a2b/sapodepulukadelowatoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27c4a8c-8402-4117-9ff4-d62c7362117e/kazurimiwolijibefukeka.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_1a810b6e62e140d2aef72f8663b3964a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bafd9c3-f029-4c8a-ba99-794be2e6e52a/jbl_flip_5_vs_charge_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4cbaa9e-854f-4d3d-8992-b365ff9403a3/three_questions_leo_tolstoy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3ec6e8-c3f7-4fd4-aa5e-85e71169fdd1/fufijinufipesoku.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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5268 bytes
SHA-256: f26483c2cc4a795e55051066866ea23c9c1ddc05bbec40500f7af13a23906c3a
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 11512 bytes
SHA-256: b1c4f7b3246040dc7bfccd5ab8a41d9e34f08f0e9d27233db5b845a9b5556e8a