Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4275c5c137c04c…

MALICIOUS

PDF

70.3 KB Created: 2021-02-23 22:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f8e6ff9bd4db610660ba2f0ae148aa02 SHA-1: 5c144862654c35f9d8619a402869ab7fbbd9c1dd SHA-256: 2c4275c5c137c04cdb0002c1d43da2897648d8b7321b33151e8eb5158ddce755
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+train+your+dragon+book+1+chapter+10 In PDF document text
    • https://cdn.sqhk.co/rugofufol/OSjgnjt/53577795565.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/6449948.pdfIn PDF document text
    • https://zesudegefomoga.weebly.com/uploads/1/3/1/0/131070027/8138253.pdfIn PDF document text
    • http://tihefers.online/united_nations_demographic_report_2019b1329.pdfIn PDF document text
    • https://vudubigudimuw.weebly.com/uploads/1/3/4/0/134016717/7501052.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/87c389fed45ffe3.pdfIn PDF document text
    • http://mikrotikwizard.com/83414277653eb6ys.pdfIn PDF document text
    • http://texno3ua.com/70850966481iczqu.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/sobemovirev.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/a8a1a912.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/c5ff03305b2.pdfIn PDF document text
    • https://cdn.sqhk.co/merivexasug/igiMibl/toddler_paint_and_draw_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugapadilubokis.epizy.com/nigerian_newspapers_online_today_sahara_reporters.pdfIn PDF document text
    • http://mutojux.epizy.com/pdf_to_word_support_arabic_language_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/based_on_kpa_ft_crayon.pdfIn PDF document text
    • http://delezomixotu.epizy.com/hallelujah_handel_sheet_music_free.pdfIn PDF document text
    • http://kobatalizaz.epizy.com/razor_e200_battery_replacement_instructions.pdfIn PDF document text
    • http://femolejo.epizy.com/72364258046.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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 5676 bytes
SHA-256: d93e471ed19551890edd0fca9d47989224bbb1f62bc6ce6bcc0261d4ee3af791
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 10288 bytes
SHA-256: e83812dd55c55653e66df9b799e4a20ed830af3d169212a8c033a97358703dcf

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