Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b69396f2879274…

MALICIOUS

PDF

76.2 KB Created: 2021-03-30 19:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f9058c3f38cb45528f8418311193c5f SHA-1: 46f18ad987f40e68d7c5561622824d6c08342037 SHA-256: 88b69396f28792748ffbfc07fb415de77eb1453ca2fce99d7968f29ebafb3422
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, https://xajibur.ru/strik?utm_term=maytag+front+load+washer+error+codes+f06+e02, is presented in the context of Maytag washer error codes, likely to attract users searching for technical support. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful 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://xajibur.ru/strik?utm_term=maytag+front+load+washer+error+codes+f06+e02 PDF link annotation
    • http://pikejofopon.mypressonline.com/apsc_prelims_syllabus_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_603d7466e5e9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fe10cc7a155e.pdfIn PDF document text
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/5342743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5fcf404642975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_6011e0169b3ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489586/normal_6004af5db28e4.pdfIn PDF document text
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/wefixonezo.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/zunaporam/moonkin_guide_8._1._5.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/id_channel_tv_guide_for_tonight.pdfIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_8ade609ba07e40f3b1437f37b0f090ce.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_cd95ba93550b4258b0baa42665e28262.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_8aa51de4048444bba88339b181705b26.pdf?index=trueIn PDF document text
    • http://wutesejib.onlinewebshop.net/persuasion_jane_austen_movie_where_to_watch.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_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 5912 bytes
SHA-256: a8a2476a6c8d020f9a0b8ff98bca2a7d530fbd60a73effd029f48efb5e5a0643
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 10492 bytes
SHA-256: c1de57590b8312accccb7de2294232c7db4ccf13f6f25d4e86078949efe06fa3

Open this report in the interactive analyzer, or submit your own file for analysis.