Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad08467d59b4cd1…

MALICIOUS

PDF

69.7 KB Created: 2021-03-24 12:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 06841d7a853d0d8f7a427312e23ef6df SHA-1: 551c21ac9cc182f84178e410ebde315ec4e7adc0 SHA-256: 5ad08467d59b4cd1c21936b3ee36d7d57d02a32963f5edde7557ea363f77a5f6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm operation. The ClamAV detection and ML classifier also indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the presence of numerous external URLs, including suspicious ones like those hosted on 'bologen.ru' and '66ghz.com', points towards an attack pattern focused on redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=medios+de+comunicaci%25C3%25B3n+oral+escrita+y+audiovisual PDF link annotation
    • https://cdn.sqhk.co/watagovu/Lihhcje/63116607983.pdfIn PDF document text
    • http://xadixul.66ghz.com/sustainability_reporting_software.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/gcljjgJ/80229771259.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/z6jcng7/20311772293.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/ghHZhgH/racing_drone_online_store.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/loranoduzuja/why_do_i_have_a_fat_face_and_skinny_body.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/the_spectacular_now_sad_ending.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_e7f55298207243f6b7f5a8e2c2161338.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/24798215533.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/visa_invitation_letter_template_singapore.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_2e9306413f604505b852da07603b5fda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakusineba/ragibuvapozezelare.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/88543641262.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/vuzuxotaju.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/free_patient_intake_form_template.pdfIn PDF document text
    • http://dapunujunet.epizy.com/wamotixa.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/flocabulary_answer_key_unit_10.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/avengers_endgame_full_movie_online_leaked.pdfIn PDF document text
    • https://fea50346-ab34-4b67-843e-90a6383c4983.filesusr.com/ugd/bf678e_c3b1a0d333164eee8d0e1b7ca16cb9c7.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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 5388 bytes
SHA-256: 9e7ffffc6e02af20eda00a48652a58958befa72b67d237f2ab0795d9ade8cdce
font_01_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 10152 bytes
SHA-256: 26b103231fa2fada010febd849548a1fba091cc05ef4e11bc950f5f5cb658af0

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