Malicious PDF — malware analysis report

Static analysis result for SHA-256 52740609802cb929…

MALICIOUS

PDF

69.9 KB Created: 2021-02-27 08:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 35f019c63546afe33b2180e7cfd2ee61 SHA-1: 2a3607cfd25de6a75745de930bb6116c5e7a868d SHA-256: 52740609802cb929404073d22c1a80eced58f2099980251fc6b82691cb1d1206
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

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://soxebez.ru/strik?utm_term=bear+apprentice+2+pink+camo PDF link annotation
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/mobuk_gajura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_60143ca77734d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_602f600c14288.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/43226274263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_602e5b04d04f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_602eed541e6cf.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/0303b1deb3055d4.pdfIn PDF document text
    • https://zetakopazo.weebly.com/uploads/1/3/5/3/135351561/xidavifagoxob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_60126300a2070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_5ffcc761bb063.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/vuguwaxunex_xerejige_xanujikodigaduf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fdfbb764cf0e.pdfIn PDF document text
    • https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/8964238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5ffa9668e386d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dosekidonara.epizy.com/medagidebe.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_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 5112 bytes
SHA-256: 16d460cf709a475bbe84edb16fd5572ae0609503c7e3f3a4223ce526706b22e0
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 10692 bytes
SHA-256: 23429429b38f0781bfa9693bbdf7dbf1484d3044810748040eef9584ac537cd1

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