Malicious PDF — malware analysis report

Static analysis result for SHA-256 27546a61eec67e9d…

MALICIOUS

PDF

70.7 KB Created: 2021-03-29 10:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72e6f2d9a944d269bdf667fb6426fd10 SHA-1: 263e0104c5837ba1de7405260e39716ad5d280cc SHA-256: 27546a61eec67e9daa86a29d12e73946513d43126840313eb2a56eef2ff2d18c
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 hosted on disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns point towards a malicious document designed to lure users to external sites.

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://ponafet.ru/strik?utm_term=america%2527s+book+of+secrets+season+1+episode+4 PDF link annotation
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/6778060.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/cbb15eedffa00.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/09fc60c1f9252b.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/d159d.pdfIn PDF document text
    • http://viwumurowiwoba.22web.org/architectural_drawing_standards.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/9da55904-8a60-4565-8baa-8b663d1f35b0/salems_lot_1979_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eba868a-7798-4af7-ae10-6195ed681d46/86398019182.pdfIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_69cb1250a8aa4e05bf3fa727bddc33eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f5ff4f-447d-4bf0-b4bd-651a2767d129/frayer_model_2_per_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efa4001-7a92-4214-b0bd-20ecc10f86a7/forobojulagekop.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_aa50642f4cb24674b070e17dd084a001.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_98d8dadb2f1c4317a9a452c328cb0d9c.pdf?index=trueIn PDF document text
    • http://fefekug.rf.gd/transform_css_to_scss.pdfIn PDF document text
    • http://disejeninajexak.rf.gd/john_deere_l110_deck_parts.pdfIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_d4db65bc8e5240e69804acbc953987e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa75d49-00a6-4f29-990b-97d31d0711af/what_kind_of_art_is_popular_in_spain.pdfIn PDF document text
    • http://golizewojavizav.epizy.com/sotamaroj.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_0b4914acc884478dafe0bfae8e72a93d.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_50a5f5236d3f447499ff61116838e06e.pdf?index=trueIn 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_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 5636 bytes
SHA-256: 38b6b047d6588f1ea70df415e96b5d0487c829477966cd4ac4938ec2f6206ed7
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 11700 bytes
SHA-256: cb8d13e2afc32597ddce090470412a269d54b1cd3048ef5427a7b442eea412d5