Malicious PDF — malware analysis report

Static analysis result for SHA-256 f529413767a8fd6a…

MALICIOUS

PDF

108.1 KB Created: 2021-03-24 06:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c95fd5a477c5a4d50e94f65956c2f26 SHA-1: a4afe4abd44937f266cca8b8757a7d4621c50d9a SHA-256: f529413767a8fd6a877a011fc54df8e1d4bd0c154e48314339c2ce36c93a6fdf
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector link, designed for phishing via a 'free download' lure. The embedded URL, https://soxebez.ru/strik?utm_term=pretty+little+liars+book+cover+characters, is the primary indicator of this malicious intent. ClamAV also detected this file as a phishing trojan, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/strik?utm_term=pretty+little+liars+book+cover+characters PDF link annotation
    • http://fruktovik.com/99433374246isj3s.pdfIn PDF document text
    • http://infokurs.design/98221063623fy4wm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_6010983dd92bd.pdfIn PDF document text
    • http://hurricane1.space/workpro_quantum_9000_manualkqyfy.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/68345160466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_60470e8259e54.pdfIn PDF document text
    • http://odemebayisitrafik.com/fikemutetarezasadedapikue9lew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_6032737ebeefc.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/juzinaramip/88869763962.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/add_math_igcse_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4966f756-0f2c-48fb-b0ba-31ed32710435/what_to_do_if_dyson_vacuum_loses_suction.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/the_end_of_evangelion_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4d5da8-4384-430e-bde6-8ebd3df3b5a3/will_supernatural_be_on_hbo_max.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/wipowarebejasuluvaru.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/tuercas_y_tornillos_elster.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_off00016ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC4 5256 bytes
SHA-256: 7a79ce0cd26f03d93e6c27e25be88e224bd406c00f50470607d8af4cc39a893f
font_01_sfnt_off00017cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAC 11016 bytes
SHA-256: 0afe455d1c23171d4e1b68baf4a8333e1802c3f39f71e453cb61e86690fff694