Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4ce0f5b645b49d…

MALICIOUS

PDF

73.1 KB Created: 2021-04-06 23:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 01f35096c6fc5b398d1e44a4e6acb68f SHA-1: 22e2af1342eb63dacd0d0a1b8125457f12caa97e SHA-256: ff4ce0f5b645b49dc3da894ca16fc947fef87bf4f793291dd6d7cd0f9cfcaaa2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the PDF structure are consistent with techniques used to drive traffic to malicious 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://nipisod.ru/award?keyword=bessemer+furnace+pdf PDF link annotation
    • http://sadinexiwa.mygamesonline.org/zawoxijelosipulovokodipu.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/how_do_i_reset_my_frozen_harmony_remote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_5fdaa8e632e5c.pdfIn PDF document text
    • http://pokinusuvato.getenjoyment.net/hysterectomy_steps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_602f98c1ba8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_6065f2c0afe1d.pdfIn PDF document text
    • http://domotoj.sportsontheweb.net/wizedebufukivusetura.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/sojumobuxikunodozuvewidut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489848/normal_5fce33daee740.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/logic_gates_and_boolean_algebra_simplification.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_603a26d61922a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_606c235648a06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulizin.epizy.com/debomovular.pdfIn PDF document text
    • http://tuzugewidided.rf.gd/film_habibie_ainun_1080p.pdfIn PDF document text
    • http://nukamepewavux.epizy.com/vorolagam.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_47872bac7d6041498b15c3f8c29b7cf2.pdf?index=trueIn PDF document text
    • http://fuvarijes.atwebpages.com/conducting_marketing_research_and_forecasting_demand.pdfIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_be0ac5148c6d4bd6a367115d62305b07.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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 5320 bytes
SHA-256: a5da67e4d3a3da1fe5a20ff3f64a15a7cc2f24895eb6453b5b6751372db65c05
font_01_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 10740 bytes
SHA-256: 8ad739cb34536520476bb09cc6274ccf145fb25125cf8b59f3fb430addc889a1

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