Malicious PDF — malware analysis report

Static analysis result for SHA-256 f725f979b65f4d6c…

MALICIOUS

PDF

90.5 KB Created: 2020-12-24 08:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3df7c4b009646e11a4bb0ede0c602bed SHA-1: e3301ca059d8e23d15ae942488038eba41deeb57 SHA-256: f725f979b65f4d6ce8e9f57f74e5e329e52e77bfcf73e5f77d7a26a4e2ff72d2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Airbnb stock price ipo', suggesting a lure to financial-themed phishing or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/strik?utm_term=airbnb+stock+price+ipo In PDF document text
    • https://cdn.sqhk.co/xowuzaseku/IMzOijK/no_suena_kontakt_cubase.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/3ce04e8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fd31ddd08d72.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/fbeb6b9b-fe70-46af-93a0-6bab0bb6a6d8/transmisiones_automaticas_ford_windstar_2001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f47709-4676-421c-b485-74d29ccfafe3/numaniraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ceffed-3bce-496a-b9ae-4140c045ee3a/3.5_dm_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610bf18d-45bc-4ab9-ad4f-df7081084197/73802736366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb5542c-673a-4bd6-ba84-79c0e6e63f59/dragons_world_breeding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf30799-119d-47e0-8439-c6e836d66dbf/organic_chemistry_for_dummies_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78df2c31-c808-4b2c-a208-878f599c7e50/novena_a_maria_desatanudos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cb3ef0-39f3-402c-afe7-7d354b5fcf0e/67456560540.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_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 4880 bytes
SHA-256: b60536a2d374744d1c1abc4f606ea7886e44969395909f4ce13ca607290e28c2
font_01_sfnt_off00013447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 12004 bytes
SHA-256: c13a975fbe3ad19de7c4a74b5333801da0170a232faecb8e79397dbc830bafe1

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