Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cf3e37b1f734de…

MALICIOUS

PDF

89.4 KB Created: 2020-12-31 11:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cd9a8760d6c434e0bcca5a7b0b101b40 SHA-1: 6f492bf012230240180d3320cdc6a329f4b35aae SHA-256: 57cf3e37b1f734dee86647835257054bb0b26326f440049cd63fc78127c5bfd0
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, identified as a link farm, directing users to potentially malicious or phishing websites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=lifespan+of+a+spider+monkey In PDF document text
    • https://bogujodoj.weebly.com/uploads/1/3/4/8/134881838/7737236.pdfIn PDF document text
    • https://bigififipajug.weebly.com/uploads/1/3/4/7/134709095/liwaxelabeb-loberujoleriwa-tavisikoduravuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5fa37b3c62cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fa4fddcf1a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8957e69e8f3.pdfIn PDF document text
    • https://cdn.sqhk.co/bagojenul/bRjcrje/street_dunk_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/gjjdqgi/klondike_solitaire_patience.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_5fa7bf4e8e97a.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/bonuket_gedepudiwoso_nidawowogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc990fae2609.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/16212633-02f7-489c-9122-73ebf588e086/63156893942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aafe21e-5157-46d7-a399-36cd5e0aa840/joxexevifugikilasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00f7577-66b1-45c1-a9cd-c8260d20a6b7/33564807495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082be8f3-49fd-412e-9949-bbce231c82e6/1194529392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d706603-58ef-48b3-89ff-7e2c8b066909/tasikoxakegebow.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_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 5260 bytes
SHA-256: 52feb06cc7bf832a1e08ea2990e05b6908325a62aadcb584d9bb868d170f7225
font_01_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 10472 bytes
SHA-256: f869dd115439f3b68b5db99f27c8f4bc2a8a7d6c708f816dce391761cc9a128b

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