Malicious PDF — malware analysis report

Static analysis result for SHA-256 657a7bc8df470a8d…

MALICIOUS

PDF

73.9 KB Created: 2021-04-04 00:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6d9c89976eb93337542a3e581ab68236 SHA-1: 9c6f9b74d198a1090de3e650790944a3a5f6d7e2 SHA-256: 657a7bc8df470a8d583d7a5736d03d79cd4fbf18294e58a2c691087191a58fca
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains embedded links that redirect to known malicious infrastructure, specifically targeting search terms like 'craftsman 675 series lawn mower spark plug'. The document body, though heavily obfuscated, appears to contain metadata related to the wkhtmltopdf application and a date, suggesting it was generated programmatically. The presence of numerous links on disposable hosting and a redirector link strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://yafferge.ru/strik?utm_term=craftsman+675+series+lawn+mower+spark+plug In PDF document text
    • https://satemegozujig.weebly.com/uploads/1/3/4/4/134477909/kojenikujili.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/agguhdj/95132258062.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/dc863d896.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/25862eb05.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/4816489.pdfIn PDF document text
    • http://nogezat.iblogger.org/someone_anyone_something_anything_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/iighifP/wall_mirrors_for_sale_cheap.pdfIn PDF document text
    • http://nujusepu.iblogger.org/59148528594.pdfIn PDF document text
    • https://kibepujuvug.weebly.com/uploads/1/3/4/6/134644113/2122941.pdfIn PDF document text
    • http://it50discount.pro/brexit_agreement_full_textv3pfy.pdfIn PDF document text
    • http://inertbhjbj.ru/1891837565q6uer.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/83a1d8c7-ef8a-4f0e-b65a-3c79d13659ef/tiropivujaz.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/malphite_guide_ap_tank_mobafire.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/74917149943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a4dc0d-8af8-4a05-bc75-5dc75816edde/ralepejunosogebin.pdfIn PDF document text
    • http://warugadagix.rf.gd/el_pas_de_las_sombras_largas_resumen_captulo_2.pdfIn PDF document text
    • http://zefudisese.rf.gd/22112812384.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/rajisubefufawovesaku.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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5640 bytes
SHA-256: 284e364c8510e0211fd28d9a0423ac5dc44e539e8fcfd4c142a5bac33b79180a
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10816 bytes
SHA-256: 3b1a578285d418df7db0992ed52bd04d9d95ccf4813983fa9d177beb731513de

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