Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f631636f8090a…

MALICIOUS

PDF

81.2 KB Created: 2021-03-09 00:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 859a080b10b1d46bdc86c2c65e9be9c2 SHA-1: 4eda86ac244276582217938718afa4db73b46015 SHA-256: c84f631636f8090aae2520a53b4eff3f7767a26dc47bde25bf9b3da9379947f5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also returned a high confidence score for maliciousness. The embedded URLs suggest an attempt to direct users to potentially harmful sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://crophysi.ru/wix?keyword=the+marshall+mathers+lp+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6018212c906ba.pdfIn PDF document text
    • http://idealslimitaly-official.site/troubleshooting_hp_officejet_pro_8600_wirelessu7rh3.pdfIn PDF document text
    • http://shishkin-seed.xyz/lactic_acid_bacteria_fermentationiel7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_600bab7f427b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_603ac591d5d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_60222215cc3da.pdfIn PDF document text
    • http://fumigatoff.online/sazekuobb5t.pdfIn PDF document text
    • http://trycabinets.xyz/vixedovukeseromiwusokaqossi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_603a298915ee2.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/gigepumogidesituxcxkk.pdfIn PDF document text
    • http://jobauthor.online/fozubudas7unye.pdfIn PDF document text
    • http://strgb2.ru/doraemon_ka_cartoonqgzri.pdfIn PDF document text
    • http://paksorond.xyz/37307865764kuone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://milodip.epizy.com/14278920589.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/what_order_should_you_read_the_books_of_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/how_to_reset_firex_i4618ac.pdfIn PDF document text
    • http://tawoxigedokewu.rf.gd/physics_formula_sheet_grade_12_cbse.pdfIn PDF document text
    • http://nefaped.epizy.com/93453164373.pdfIn PDF document text
    • http://botozagelexi.rf.gd/munupetasebavexuwuduloma.pdfIn PDF document text
    • http://fabemode.epizy.com/is_schwarzkopf_igora_ammonia_free.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/62532272700.pdfIn PDF document text
    • http://bamalupit.rf.gd/base64_to_java.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_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 5240 bytes
SHA-256: e493f9aa7469f07aa6bd34cdb2645855fdd8df5ebd994874e56ef2c5ec3f3639
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 15588 bytes
SHA-256: ebad399a19a0c7c4cc02873b1c7b2057a8a1687045dc9ddec5853c0f4118dcfa

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