Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5dc94ff20cc0d3…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 00:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8c6fac79ca3005cc9c4ca57e68d0e6a9 SHA-1: fb493708544b4c7bfb7531d7646094a43c745748 SHA-256: eb5dc94ff20cc0d3d0d99403adca1b45df020696224d9210ba45a3bed2bd08a3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO manipulation or a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=routine+tests+during+pregnancy+in+india PDF link annotation
    • http://bibivire.mygamesonline.org/kevaxejad.pdfIn PDF document text
    • https://jazelufum.weebly.com/uploads/1/3/5/9/135965355/rafirotemoji_fupulusifex.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/9600269.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/4811407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2272d3-ab81-4983-b78b-8b247e4377ca/vasotiwemomal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf48a24-cd21-423a-aff4-c0b2905c2ce6/87789653778.pdfIn PDF document text
    • http://vazavaxajude.rf.gd/backtrack_4_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202382b9-6ebd-4701-9e39-1266b7b7c1bb/dexigaku.pdfIn PDF document text
    • http://mudusogej.epizy.com/jigegopif.pdfIn PDF document text
    • http://nitovotiroxe.epizy.com/netpatch_firewall_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127a37d6-2c95-4c8c-9f66-423ff992861b/what_is_the_arabic_greeting_for_hello.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20f13a7-8c9b-458d-a608-df41115cf031/biologa_celular_y_molecular_lodish_7ma_edicin_gratis.pdfIn PDF document text
    • http://xokifenutotumu.epizy.com/wuzidiwezenarotigajazu.pdfIn PDF document text
    • http://fuginifetulad.epizy.com/10th_std_new_book_english_medium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19064304-cb9f-47a9-bf5f-c1ec3fa7b588/26248730810.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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 5320 bytes
SHA-256: c2233553164e82f2922facbaed02b06a9cdb5d01b92327c51da576f6027e9a01
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10916 bytes
SHA-256: afa7acc3c7507a019a823c2b479e9a079d8e5016b9a002f805d014d282818a4a

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