Malicious PDF — malware analysis report

Static analysis result for SHA-256 da44f1f39cce95b4…

MALICIOUS

PDF

81.9 KB Created: 2021-04-14 22:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 707016c7bf2bded9f7cda55d6b32f98d SHA-1: 28e29c782b97a9de09804a172b439a1276813f1b SHA-256: da44f1f39cce95b424181fbdc6e4503e2b6f09882e8abbc0029ad8e63ef40231
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://maypoin.ru/strik?utm_term=is+there+a+glasses+emoji+for+iphone PDF link annotation
    • http://lorenbayi.com/130462808063g6v0.pdfIn PDF document text
    • http://ranking-se.com/92799599070k0s1w.pdfIn PDF document text
    • http://prazdnikprosto.ru/srtm_90m_digital_elevation_datatnt9o.pdfIn PDF document text
    • http://jawomubinuj.iblogger.org/18540018492.pdfIn PDF document text
    • http://bufo.online/jajujadafilojavuxasofafocyz9w.pdfIn PDF document text
    • http://fb-copyright-help-from.com/4472537212029afv.pdfIn PDF document text
    • http://getcabinets.xyz/povezsrbe1.pdfIn PDF document text
    • http://getcreditcheck.info/higher_chemistry_data_booklet_201979vqg.pdfIn PDF document text
    • http://bofesota.66ghz.com/esc_atrial_fibrillation_guidelines_2020.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://ygrash.website/beat_making_app_apkxj79t.pdfIn PDF document text
    • http://dom-bita.org/descarga_la_biblia_gratis_para_celularehglg.pdfIn PDF document text
    • http://mnogoturov.com/sonazuzuxunitodutekobuhculn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_a8860c63adc0428d871cb39b6ad8b0e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a29a85c-e590-4de0-9b7f-1ccfdbe66360/tixufufinutopafudibibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d0772f-9e24-42e9-8b09-2801c4982918/16286925688.pdfIn PDF document text
    • http://xitajorowemep.epizy.com/81480862247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66d2e99-f7b3-431e-8298-e397eb27624a/princess_diaries_3_trailer_release_date.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_40527b5f5fea441fa3e19c629d262113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6550c07b-13d8-4aa3-b799-2edb56196a81/92122115726.pdfIn PDF document text
    • http://zadosaw.epizy.com/all_maths_formulas_for_ssc_cgl.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_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 5328 bytes
SHA-256: 4af3723ec5c3d4b092be83a29f49f90b110d06a145cf95b9243492e4ce526f07
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 11244 bytes
SHA-256: 7c70208c0022129ccdd02347815b46ce6a7c8d70458364a2902d9ea55844e216

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