Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec3a6128e44c88f…

MALICIOUS

PDF

73.6 KB Created: 2021-05-19 19:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9d7028380f60661c59292f35737e0569 SHA-1: 98f9147b216f12ce90e491e1273e9318e89283a5 SHA-256: 6ec3a6128e44c88f66d8a951456cf2b9bef465a6638d20c19e7f518d307664ef
156 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, a common tactic for SEO spam or phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'zesidorav.weebly.com'. Another heuristic, 'PDF_URI', points to 'mezovuduw.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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 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.
  • 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://mezovuduw.ru/strik?utm_term=horse+rug+temperature+guide+australia PDF link annotation
    • https://zesidorav.weebly.com/uploads/1/3/1/4/131437831/pipir_kovajozoso.pdfIn PDF document text
    • https://tebivozov.weebly.com/uploads/1/3/2/7/132740763/viwek-xobewak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_601602d44272a.pdfIn PDF document text
    • https://ranagujiw.weebly.com/uploads/1/3/4/5/134585077/9965a.pdfIn PDF document text
    • https://mogogumabes.weebly.com/uploads/1/3/4/9/134900096/davavumubosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_602f8cf394db6.pdfIn PDF document text
    • https://fosozenasavo.weebly.com/uploads/1/3/4/8/134889966/7472650.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/lofese/famous_quotes_from_shakespeares_henry_v.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/guided_by_voices_sweating_the_plague_pitchfork.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/alamofire_audio_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/4499297474.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/dieta_para_hernia_de_hiato.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/calories_in_bojangles_chicken_fingers.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/comforter_bed_sheet_set_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/98646276971.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/42836485457.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/evaluate_the_definite_integral_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/leposagidugub.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/fumipipizufujenobam.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/35031465161.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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 5240 bytes
SHA-256: 3c307e053004ab1b6af73d1642abd850b4c2766fe6a4c413c939581fa28711ab
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10492 bytes
SHA-256: b6bd4dfc9b98532ec5252033f0d7293cf0d2f12213a483f0b61df7eb16771dcb

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