Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa21b05b44df014…

MALICIOUS

PDF

72.0 KB Created: 2020-11-11 05:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 47c014e6f5437b3afb183e639e2539da SHA-1: 2d4e363b2f12532059cce9d295e043e7271e9daa SHA-256: 7aa21b05b44df014bd810a11e4a905a73d06dfbf3b9456951a85c5fb1e2216a6
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of numerous external PDF links, including one to a redirector, points towards a link farm or redirection scheme to obscure the final malicious destination.

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://traffine.ru/strik?keyword=hrs+guidelines+for+crt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fa4f9c15b28f.pdfIn PDF document text
    • https://vonizimawat.weebly.com/uploads/1/3/4/3/134385064/pekaxunuzi_rifag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f8c00e0e4d31.pdfIn PDF document text
    • https://kosemezaped.weebly.com/uploads/1/3/4/7/134711049/javuvovuvamige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8acd87e6236.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
    • https://uploads.strikinglycdn.com/files/b762f220-5fff-49af-8de8-42a85c08b94e/ridos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9b04c7-e23c-4c42-aa7c-55a9e6ecb358/bifezofufurereterusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c1f3b0-82bc-4772-b83d-d59a74f7988a/70407168219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e34d50-cb49-4c3e-95f7-e76b9c72dbea/theme_maker_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f324b924-cf6e-47b2-a5e6-ed2e2463c705/67621964211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e30560-2b35-4d39-a3f1-ce6f17b071ae/51915540621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd36ebe1-4625-4534-a205-3848f5e46f1a/lorovodijanoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc568a2-0a7f-4f94-9374-55b7b9d70918/88530748991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b487499-d3a3-4795-ab88-05931f90cb64/98751334783.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_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 4824 bytes
SHA-256: 89434d975708383f80f3955123c018f9b27ab36e068aacc3585734b04f850708
font_01_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 10956 bytes
SHA-256: 2b3787b892077d1ef4ae31a2edfec4ecdf273630ec22a28a24c07a9f10a6f0cc
font_02_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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