Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00d43402b622251…

MALICIOUS

PDF

77.1 KB Created: 2021-03-06 22:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57945edccdd207963a46538fe8dc0b8 SHA-1: 13e054a06cfdafe2864c3e3d484228d3212ce693 SHA-256: c00d43402b622251de74f050b1dd9e5b34f8e7562b084ca0395f1d65252f7ee7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. The PDF contains a mass of external links, forming a link farm, with the primary suspicious URL being https://dafemum.ru/123. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content or further stages of an attack. No scripts were extracted from this sample.

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://dafemum.ru/123?utm_term=riassunto+del+libro+le+cosmicomiche+di+italo+calvino
    • https://cdn.sqhk.co/rujojumex/zMhgglW/wejikagela.pdf
    • https://static.s123-cdn-static.com/uploads/4386595/normal_5fde7dc8e93ab.pdf
    • https://cdn.sqhk.co/posebozej/hO1RheD/mewatowiripibalemapufozu.pdf
    • https://cdn.sqhk.co/zisubiziwu/dcWCgfL/90463359381.pdf
    • https://cdn-cms.f-static.net/uploads/4370744/normal_603c487f89853.pdf
    • https://cdn.sqhk.co/kitobanifamo/heQidia/tevozawow.pdf
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff5ce9b29f78.pdf
    • https://cdn-cms.f-static.net/uploads/4450347/normal_602dd043b7d12.pdf
    • https://cdn.sqhk.co/kekelivig/blxgdic/posixuguti.pdf
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5ff3c44e341f8.pdf
    • https://cdn-cms.f-static.net/uploads/4383925/normal_603be065ca6f1.pdf
    • https://static.s123-cdn-static.com/uploads/4465255/normal_600174af85038.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_c3933a9177054d158479030b97522253.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5506454a-9d34-4bd8-8509-14ae6200c54b/8649775957.pdf
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_68d4b444e4ca4eb78ded0ab9a6e215c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8c36da5b-7ee7-4a8c-ad9c-eed8cf327e99/27350869710.pdf
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a97f665d303f47a4a909eb7c5adf8a67.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a272ee2-15f1-4840-8f50-9bb33cd0f8b0/6954934328.pdf
    • https://uploads.strikinglycdn.com/files/81408df1-849c-4ad7-b0b4-24899eb76191/the_ninth_wave_painting_original.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_off0000f033.bin
d3a5b6645faa7cab2ea53b82669a2a190e59942d16171fc4d7d11f4ef45907b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 5388 bytes
font_01_sfnt_off0001025b.bin
c200caa859048a62553d40719f0ac6adfc80894aa5edfc8b0747c5e7af5e5186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 11208 bytes

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