Malicious PDF — malware analysis report

Static analysis result for SHA-256 b842ee6f6c7dedfa…

MALICIOUS

PDF

60.9 KB Created: 2021-02-20 04:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e2450c1881d1ba02b81c51d24a53cbf6 SHA-1: b19dcf285fb0fee08f09fb6428e88bf1bdef9640 SHA-256: b842ee6f6c7dedfaaf5cae44654d854d51da32373688f12fa1f6dfb3c567c84c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for phishing and trojan activity. The embedded URL 'https://baarspo.ru/strik?utm_term=tarot+card+combination+reader' suggests a lure to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious intent, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=tarot+card+combination+reader PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fe0575df0723.pdfIn PDF document text
    • http://gilutij.iblogger.org/6th_grade_english_grammar_worksheets.pdfIn PDF document text
    • http://biwonomapul.iblogger.org/favomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd385ef430d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fec9f6e572d0.pdfIn PDF document text
    • http://nivekux.iblogger.org/26280506645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe26785e1a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_5fe92ad701eb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupoti/40409184250.pdfIn PDF document text
    • http://wemiwapava.epizy.com/blind_date_1987_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/58649407546.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/cognitive_dissonance_worksheets.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/dudenojuf.pdfIn PDF document text
    • http://rufofexejojar.epizy.com/personal_expense_spreadsheet_template.pdfIn PDF document text
    • http://jilubur.rf.gd/tympanic_membrane_perforation_treatment_guidelines.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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 4964 bytes
SHA-256: f8ca81cec807712b11a70883a25ed4e865149df12990712fc4714c4a1fe28129
font_01_sfnt_off0000c684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC684 9540 bytes
SHA-256: b5cf6b35b2dbc71283cc17898d39e266d180078585f9a555eddb129afb92c15a

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