Malicious PDF — malware analysis report

Static analysis result for SHA-256 4158a3f99f4d9ccb…

MALICIOUS

PDF

84.9 KB Created: 2021-04-28 18:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 114aac56c164db8328a96fdcc39ea34e SHA-1: 5b51824bc7d6f79b588e501a37d8ea06a6e5cff1 SHA-256: 4158a3f99f4d9ccb9be216e28eb404ad5d759b25bb9fb4261b903eb60773505f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=thinking+fast+and+slow+daniel+kahneman+review'. This indicates the document is designed to lure users to a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=thinking+fast+and+slow+daniel+kahneman+review In PDF document text
    • http://kajuzumanaz.sportsontheweb.net/58633259137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_602936a4549af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_6049362ac1a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454429/normal_6004aa304f3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_602e399442026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_6029282fc64a6.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/gipofexatuwatovefa.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/jdihglF/tafomatudiluzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_601bcf673827b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454694/normal_5fddab981255a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_600dc45718210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_602c017fda0d7.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/ZsifJRv/keyboard_design_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_603d5ad334648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5fe663df5399c.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/hb8u1eZ/modest_mouse_albums.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_6066be27368f2.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/35073088-8a91-44f9-a728-dc65012fd62b/58278276276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a80c66-17f4-4034-87b4-4ab4eeb17f2c/breadman_bread_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201e1f62-7577-4cdb-a706-2845eca51ea4/84476224065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c74f64e-9e03-4c6a-951a-d9c1baaf8267/ludotax.pdfIn PDF document text
    • http://xirofapinowud.atwebpages.com/silirifexexinikoji.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_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 5488 bytes
SHA-256: 4db173be0bf2fc4976cd4160a4cc37a6a079ad70b6440fbda9a3b3b5d79e79d5
font_01_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 11092 bytes
SHA-256: 70aceffa68f2de289b96dd4dd060a134cfa67dcb99d608c4a77aeca8523a9cb8

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