Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57fb82643a8d45b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-26 19:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1755d134e1eb1959b6e041ec42d397df SHA-1: 29d9e32e4d2106960b91ad12160df56e9e182414 SHA-256: f57fb82643a8d45be0d2a7498d66e7e0b62b9a9142fb31e5c3a15cfe49def4f3
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external links, one of which is `https://pelibifir.ru/123?utm_term=banner+design+fonts+free`, likely to obscure the ultimate malicious destination. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=banner+design+fonts+free PDF link annotation
    • https://cdn.sqhk.co/pabelemusib/ihjgihB/gulobunivenujur.pdfIn PDF document text
    • http://tugrull.com/taretilofo3nmbd.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/oifidgg/packing_box_size_calculator.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/a3292da91be8c63.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/l5ODPii/30737333908.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ia3jjst/ap_english_reading_comprehension_practice.pdfIn PDF document text
    • http://hookup158.fun/kufanuvokogipivervt4e.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/8773765.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/scgfwhd/30304647603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_ba46196c9e874fa9a11d3a942d20df76.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_f6a15ec7d0f348909d5624ec8d077b2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/formato_de_minuta_de_junta_en_word.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_0888a6795ad74d1e910c071ea594970e.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_add8c8ff5fba43008fb5115cedde93de.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_6c127bba86bd479e9ffd512909aa609c.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_371724ce301246b88505765d47d366a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudowo/autocad_2014_student_version_free.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_3419b8891d824c3aa3ed821278fe685a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wopari/reketulixoza.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_a2c04d88fa9e40f7be8e4dd8340d1b29.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_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 5092 bytes
SHA-256: d608c3c54e6a6ce7f54247d9b40bbf2e69ff0eeaea44b378c673dd03be131747
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 11304 bytes
SHA-256: 318a935ecd7136ec3e443975589adf8e80837db7bc99d0b66c93ceae7f1d9c7a