Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9999aa123f5402…

MALICIOUS

PDF

71.7 KB Created: 2021-03-02 19:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01fa92b82b6ff562cb3303317b293e7e SHA-1: 1e3d7d34c8cb471d591f0946c42d543edcb6f17a SHA-256: cb9999aa123f54028813ce8ab84e242d118fddd437d5099587c5aeb87a0c4921
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the embedding of malicious content or redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=evolution+of+trees+and+plants PDF link annotation
    • http://trenolgia.buzz/kaxibixupanejopizocq72r.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/xuxatipaxax-fozedikalag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5ffeb1e70e447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_601ce93637d10.pdfIn PDF document text
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/6513586.pdfIn PDF document text
    • http://piredvizhnik.com/padidatimimawoy27nr.pdfIn PDF document text
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/51fae8.pdfIn PDF document text
    • http://adminhalil.com/23486422476rck6j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_6025c8ef144ed.pdfIn PDF document text
    • http://simultaneously.space/xezosilasutivobejrksu.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/zemunomipazikez/wow_herbalism_and_alchemy_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/jafekir.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/pipam.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/son_lois_lowry_review.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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 5052 bytes
SHA-256: bbcacbb39ac063e8886e5673c3849e880709091b22a59c36ab9c0ccbec9a17ed
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 10404 bytes
SHA-256: 2b571249501e64d24210e701df760dcd0411a40579cf129f72c16171fd830dc6

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