Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd5b1f23919eb5c…

MALICIOUS

PDF

70.2 KB Created: 2021-03-01 06:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8146991c114ed3e9feb03bae19de6a10 SHA-1: d5f2e2d9e7ce98989c047b4c74fb5bd664dd86d9 SHA-256: 4dd5b1f23919eb5cde048aef38c7e2a16f84d7e4618bb8a517568be2a02ba5e9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malware or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=seafood+restaurants+on+cannery+row+monterey+ca PDF link annotation
    • http://lapitubemexidi.mywebcommunity.org/are_pimples_early_signs_of_pregnancy.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/92182477731.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/495181552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490375/normal_602262fb394af.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/geVhjhg/82187003377.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/27387448291.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/igfif4K/mma_fighting_world_champion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387224/normal_600701725392e.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/hiihg5b/18783097541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamubaj.epizy.com/tubopidabipimeluxe.pdfIn PDF document text
    • http://tikikenuf.epizy.com/busenapamimitoro.pdfIn PDF document text
    • http://dafiwogi.rf.gd/is_high_blood_pressure_harmful_during_pregnancy.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/jixetobamimunit.pdfIn PDF document text
    • http://xumusemowujev.epizy.com/cdtfa_sales_tax_form.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_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 5432 bytes
SHA-256: 49c946bb2bff0f9327471d0fee90091966adda49b368d3cdb4ff850b77e80104
font_01_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10368 bytes
SHA-256: 27e2b44d20dfe7ccc1e638fe05d6a7a6397535398591d538e86a8597584c4d09

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