Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50705cea87a9943…

MALICIOUS

PDF

84.3 KB Created: 2021-06-12 11:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1d731391557840c724f79aecb8d11298 SHA-1: d74ec6e678ef3a960a8c7805ec242f1081eaefcb SHA-256: d50705cea87a99431e67b10a64ba74f57b0c6cd30819d970499265993d2a05f4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The primary lure appears to be a 'Spacebar counter game', but the document's structure and the high number of outbound links suggest a malicious intent to drive traffic or potentially host further malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness.

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://chcial.ru/pbw?utm_term=spacebar+counter+game PDF link annotation
    • https://lidajegufevu.weebly.com/uploads/1/3/5/2/135299661/9654581.pdfIn PDF document text
    • https://panujiwawavila.weebly.com/uploads/1/3/4/4/134457592/7716160.pdfIn PDF document text
    • https://zokaduxenatased.weebly.com/uploads/1/3/1/6/131637020/af122ea.pdfIn PDF document text
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/8076432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fc6fe35e7f5b.pdfIn PDF document text
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/4dfd712500f2e.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/joladi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_605bb893eb56a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_60081d72ae74c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_60543e138d82d.pdfIn PDF document text
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/xusubaxekidozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawasesofe.pbworks.com/f/how_to_write_a_retail_cv.pdfIn PDF document text
    • http://nenikobowon.pbworks.com/w/file/fetch/144749172/detuma.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/church_visitor_card_template.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/nekamom.pdfIn PDF document text
    • http://todenulaw.pbworks.com/w/file/fetch/145056543/mimalixex.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 5284 bytes
SHA-256: 223fe11e41b52d647a3a9f6710feb3955f3862bf12f5dd8ba7e01c9c868d5f36
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 10872 bytes
SHA-256: 830445e614f60c54ea589417b5cd52370a46b2f1888b45d3b7e1ae7c73f855fb

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