Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ada5ce8d090b778…

MALICIOUS

PDF

79.1 KB Created: 2021-05-18 05:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a2b9d92d1f628dc8e31fcf24cf6cbd66 SHA-1: b9db10da04bde50b198430ecca48967e8d31a521 SHA-256: 5ada5ce8d090b7780969ec8fd999d346ce056e062eb03b1276dd3ebf26091e6d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic firings related to PDF link farms indicate the primary goal is to redirect users to potentially malicious websites.

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://jacksth.ru/strik?utm_term=desarrollo+del+ni%25C3%25B1o+y+del+adolescente+meece+2000+pdf PDF link annotation
    • http://fasufigige.iblogger.org/20625479558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_603f622e85b47.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/xuvujutoweb-xabese-jukexavevuselap.pdfIn PDF document text
    • https://vokipokulolobu.weebly.com/uploads/1/3/4/0/134016984/davakape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60136807813c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_60124199a85fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486775/normal_60628a70ef5ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_600f3c2c4b675.pdfIn PDF document text
    • http://wabuxon.iblogger.org/business_cards_maker_apk.pdfIn PDF document text
    • http://sigixez.22web.org/84156717673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumurofujidal.rf.gd/91584022216.pdfIn PDF document text
    • http://sagawojuros.rf.gd/27785681161.pdfIn PDF document text
    • http://nuzebavin.epizy.com/minna_no_nihongo_1_answer_book.pdfIn PDF document text
    • http://pewejefaxi.rf.gd/calisthenics_training_routine.pdfIn PDF document text
    • http://ropipowewigu.epizy.com/all_auxiliary_verbs_in_english.pdfIn PDF document text
    • http://gavazawedego.epizy.com/facebook_annual_report_2020.pdfIn PDF document text
    • http://gazugitub.epizy.com/go_transcript_audio_test_answer_june_2019.pdfIn PDF document text
    • http://vefugiw.epizy.com/29646938796.pdfIn PDF document text
    • http://vukagafiperi.rf.gd/robiwosijavitunaniwisame.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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5888 bytes
SHA-256: 1fec99e9248f0f54aa3d33580dd0fba41695cbd92bc0898888d49214c8302328
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 11176 bytes
SHA-256: 69db90f8f7709a19f9b944746d7b62f2f06d4136ebd80f958c472d6e1b622cbe

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