Malicious PDF — malware analysis report

Static analysis result for SHA-256 123c3eea631966c0…

MALICIOUS

PDF

69.4 KB Created: 2021-04-03 20:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91bff596a390936b2a69c09c67ae668d SHA-1: 5d4b9378fe994b2de8e79bdbc785c6d76073ab6e SHA-256: 123c3eea631966c0354c4d76ff7d25d0db5ddec04882c92e3b3943408556e6ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing or malware distribution URL. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to manipulate search results or distribute malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=woods+digital+lamp+timer+50008
    • http://strapslap.online/kowatemesunurimonoywifw.pdf
    • https://static.s123-cdn-static.com/uploads/4419193/normal_5fface811bff0.pdf
    • https://static.s123-cdn-static.com/uploads/4372080/normal_5ff0778489664.pdf
    • https://cdn-cms.f-static.net/uploads/4472198/normal_602c070335a9b.pdf
    • http://vanlit.ru/jelejifp13i.pdf
    • http://powerpoint4you.ru/how_to_be_fast_in_mental_calculationsyrdh4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_0bf38546c20145158e28702759316d04.pdf?index=true
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_9b3ea8c9b0ac4f08a1218daf714da676.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b563f27-9ac8-4ca2-bff4-a66f66aca643/72961326013.pdf
    • https://uploads.strikinglycdn.com/files/d095cc06-4f52-4b66-86de-8f9d3280cc2c/music_of_the_night_piano_chords.pdf
    • https://uploads.strikinglycdn.com/files/fba8fea0-c613-4d5a-95e1-81d251e0c907/17885291372.pdf
    • https://uploads.strikinglycdn.com/files/d3480160-c89f-4b6c-9618-539da0592d33/86642358739.pdf
    • https://uploads.strikinglycdn.com/files/0cb1930c-72cd-425c-abca-e8ce6bbfd80f/microsoft_visual_basic_for_applications_window_excel_2016.pdf
    • https://uploads.strikinglycdn.com/files/2b2bf2ce-ef43-41f6-9ee9-63eb0ccee251/30711545702.pdf
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_2a33c71168084e638b69a929d8061cc7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4da6519-7b76-422e-8605-948b9805c39c/jizasirimob.pdf
    • https://uploads.strikinglycdn.com/files/49a998cb-e254-4468-ba3b-b01d57363833/tom_clancys_jack_ryan_season_3_episode_1.pdf
    • https://uploads.strikinglycdn.com/files/ad817f01-c11c-484b-a729-26f01b307cde/44223619019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ab.bin
ec9e752346956da2fcdfe694d117f7a089aeea325efa30fc039703ee8bede95f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 5752 bytes
font_01_sfnt_off0000e534.bin
b0b7561789d0ced8902160ed73887158a15118017238a01ace0b22b997398208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 10284 bytes

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