Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55f17c3dd2e3096…

MALICIOUS

PDF

82.0 KB Created: 2021-02-16 07:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed3e2a43169c6a578deea949ecf115d7 SHA-1: d20ab78aa1e2ac4d3539c71579ea6f09dde1ec4a SHA-256: f55f17c3dd2e3096a84bd41a3c1d85993519ddcf32340205bad26f68d21abf7e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to a book title and the authoring application, suggesting a lure to disguise the malicious redirection. No scripts were extracted, but the presence of malicious links is the primary indicator of compromise.

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=a+court+of+mist+and+fury+pdf+english In PDF document text
    • https://cdn.sqhk.co/jopubelo/ggY6Yic/84715448720.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/2RxigXx/vexipumoxaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fd798f6adb61.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/30538141047vw6ta.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/hbrV9ja/42029487164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415934/normal_6004e4cdee609.pdfIn PDF document text
    • http://prazdnikprosto.ru/javitemuwaz4ppwg.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/dhfibBF/lujuxigabivafemumunow.pdfIn PDF document text
    • http://finansi-7.online/699276115616ppan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_5fe832859dbfc.pdfIn PDF document text
    • http://italiahot.space/template_for_earring_display_cardsbojy8.pdfIn PDF document text
    • http://rating-bookmaker.ru/tn_6th_english_guide9j72b.pdfIn PDF document text
    • http://nikecortez.net/cafe_racer_leather_motorcycle_jacket_menspw50x.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/defujo/95166416962.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/b_pharmacy_application_form_date_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/guided_reading_strategies_4._1.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_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 5660 bytes
SHA-256: 738a8740e03a1b26b5f342de01c37330a835d452ca6afbc45880b6b1c7ea35c5
font_01_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 14340 bytes
SHA-256: 988a9a959a44a966e43b9e23f32f6aba04e6afbc8c24efe35aa4b4bcefef21a0

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