Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1541563c34f2772…

MALICIOUS

PDF

81.2 KB Created: 2021-02-23 05:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c2bb14304f85456866fe455d5d00311e SHA-1: b0674d25623c3f5be8c8f799801c7f1fb8adcbaf SHA-256: c1541563c34f27727d5c4acb4599d3f4f809e6f8091ee19925ba0168e9159768
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document with high confidence. The document body, though heavily obfuscated, contains text related to 'call me by your name script', which aligns with the malicious URLs found. No scripts were extracted, but the primary attack vector appears to be directing users to malicious websites.

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 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/strik?utm_term=call+me+by+your+name+script In PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/5c5aab.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/aLye8YN/wevere.pdfIn PDF document text
    • http://nipojugotav.iblogger.org/doraemon_cartoon_movie_free.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/ravenegex.pdfIn PDF document text
    • http://pay-order.info/89099394256bulvr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_601b7d6b781c7.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/iGhhAgi/cool_ringtones_for_your_phone.pdfIn PDF document text
    • http://itactical.xyz/a_wrinkle_in_time_soundtrack_free6gij9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vezapuro.rf.gd/lal_baadshah_1999_songs.pdfIn PDF document text
    • http://vanidivab.epizy.com/rigabimujivuma.pdfIn PDF document text
    • http://masekafisixovok.epizy.com/babarimibovawasolaji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 5228 bytes
SHA-256: da4df9dbfa83ffe313dae8cf01c65da6bd9b51ec08c808e4719b4689302271a6
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10764 bytes
SHA-256: b336e48c295aa6d8675b84eafbc1e1e21529fdaeda98288d3c81f36db3cd8e0b
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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