Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6112b950c61122…

MALICIOUS

PDF

90.8 KB Created: 2021-03-16 18:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e3d79b74fe039faab87f4688407c533a SHA-1: d3cd2d0d1265850fccb04c7d852d88bebe1305e9 SHA-256: 8c6112b950c61122c547545de53d3ad3703885bc6f145fb45a6f8d963bf51865
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://yafferge.ru/strik?utm_term=hamilton+beach+oven+roaster+recipes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5ffdeff2ed4b9.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/54889231324.pdfIn PDF document text
    • http://erethiztzj.space/35844598236aonk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_60489bff3c546.pdfIn PDF document text
    • http://lavka-karamel.ru/76068417964q9kwu.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/29294108986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_6010e92ccd967.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/591960.pdfIn PDF document text
    • http://about-igsupport.com/marigatotalezedsbz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bede240-2cd8-4566-aee7-716cfbd82f2a/where_to_drop_used_clothes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2edab04-0e63-4eb9-afdb-063ab4a2743d/bekomopavazogovusokeno.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/42162932859.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/best_free_graphic_design_app_for_ipad_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb63e134-6dc7-49a3-a673-8f289bc483bc/adc_v520_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/gtn_650xi_transponder.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/the_intouchables_theme_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9870ce8e-aa22-42f6-a053-3202dbc06806/craftsman_12_inch_band_saw_tire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7d3858-d796-4c9b-8850-5a087b506c4b/76740999756.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_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 5336 bytes
SHA-256: 2f6c6cc9de143b81633435fbb3ff496ab955760afb6a0da3da6bb4894beca79f
font_01_sfnt_off000138fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FB 11012 bytes
SHA-256: bcf26a657606adfa82b4ca59d432fc1ada18ccf9cb5675441660ac50048f8c83

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