Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6041630a06eaf8…

MALICIOUS

PDF

56.8 KB Created: 2021-02-19 14:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c04487058fde75852598cce9ddff8b9c SHA-1: f5a9424b4419da4d680cfe9d5e0db63b631ee539 SHA-256: 4e6041630a06eaf819f0c537852620d2d57252d10eb6c01d97501cf0fb0439e0
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary URL, 'https://jacksth.ru/wb?keyword=how%20to%20read%20aem%20air%20fuel%20ratio%20gauge', suggests a lure related to technical information. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic to potentially malicious or ad-filled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/wb?keyword=how%20to%20read%20aem%20air%20fuel%20ratio%20gauge PDF link annotation
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/wozoxuvobozezib.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/rojebapota.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/b7ae45412.pdfIn PDF document text
    • https://tugagofinose.weebly.com/uploads/1/3/0/8/130874012/3594738.pdfIn PDF document text
    • https://sejomuxajifaged.weebly.com/uploads/1/3/1/4/131437693/xetoji.pdfIn PDF document text
    • https://nuranisemamev.weebly.com/uploads/1/3/5/3/135324344/7131468.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/RhbhicI/gopapetijoredugub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusezumapaj.epizy.com/bejazuguzutujiposupojavet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/cytoflex_beckman_coulter.pdfIn PDF document text
    • http://sufizaj.rf.gd/when_the_sun_coming_up_in_the_morning.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_off0000a70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA70B 5104 bytes
SHA-256: fe8a959664240dd48b7025917cd2a7ad8100ae98b85e09268a9cee7cdc08c1d7
font_01_sfnt_off0000b862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 8944 bytes
SHA-256: c205d476206d1ac01b45dc3c4b3c9674c0ca5147bef12267878836719e36bb0c

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