Malicious PDF — malware analysis report

Static analysis result for SHA-256 7953c6d958259900…

MALICIOUS

PDF

87.9 KB Created: 2021-03-10 18:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231582fc67fadcbe581a5a8729f74a7c SHA-1: 5287678bbe3e9df1030920498ee08ba78c4942cd SHA-256: 7953c6d95825990023b8768cbdde6249af18f664de62c2f085decb9aa41cdeff
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=america+west+side+story+score+pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_6020d521cabc9.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_601cb609bf0e9.pdf
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5fe5e2790f163.pdf
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5ff9b3088ca67.pdf
    • https://cdn-cms.f-static.net/uploads/4459029/normal_602158990ee3c.pdf
    • https://cdn-cms.f-static.net/uploads/4495974/normal_601d2f3286309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_06336950b5c04581811ae12a59b9f7d6.pdf?index=true
    • https://s3.amazonaws.com/wekibik/let_it_go_piano_sheet.pdf
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_ca66df618b5f4ee5826e111ca21a3bc2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1245b8b5-7a7d-43e1-85e4-fd065aa2cba9/84010946625.pdf
    • https://s3.amazonaws.com/kisagoz/64408753032.pdf
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_f989a3f61fea419db0e9b4b7df6aa0ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85cd3db6-af5b-44e6-ac1d-5ad9aa88f3b7/54450086124.pdf
    • https://uploads.strikinglycdn.com/files/c14ad11f-bffa-438c-8191-28a0699f521c/36346715197.pdf
    • https://uploads.strikinglycdn.com/files/04aa8002-aeb1-4708-8e49-f3956edeb497/ariens_st724_snowblower_parts_manual.pdf
    • https://uploads.strikinglycdn.com/files/4ff5f4e2-35e0-4c71-ae68-76053871066e/army_pt_2_mile_run_standards.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_78ace68894b04c0b9598c08cfd917c08.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19b25f13-6716-4f45-ad75-22fb37a8450b/suxon.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_off00011b68.bin
796416a0d108028b8a2210f0e3a53d758fccb939519c2e4947cd8e72437e788d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 5452 bytes
font_01_sfnt_off00012df0.bin
08fecd91b79503d4913b3b37e4c8b482b06f68880e837c14379e133bcd0ea084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 10672 bytes

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