Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f7700a83c0c88c…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 17:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a58bc727b1c8c7f138e0be25be35420 SHA-1: fc1c5cb1d710eb5230bcfee98acb8d314d7ff28c SHA-256: 04f7700a83c0c88c62b59c2193737c08931b0ff5fc7c0c020c6be0211bca189b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a primary link pointing to 'mezovuduw.ru', suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains a title related to AI in healthcare, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=can+ai+be+used+in+healthcare
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd3dae41e41e.pdf
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/35263847ba7a56.pdf
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/wavatawilukoten-letukene.pdf
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/bepizogo-xabuwasitizuwo-pebusopomebit.pdf
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/jatur.pdf
    • https://cdn-cms.f-static.net/uploads/4367643/normal_605cd67b9d990.pdf
    • https://cdn-cms.f-static.net/uploads/4443354/normal_604cc2ee5b7b8.pdf
    • https://pimusaxasoj.weebly.com/uploads/1/3/1/8/131856122/1363128.pdf
    • https://zewogamiwivu.weebly.com/uploads/1/3/4/3/134313422/4cc681c4dee0.pdf
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/e125499.pdf
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/2959940.pdf
    • https://cdn-cms.f-static.net/uploads/4426422/normal_606438eea2fb5.pdf
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fecd573c42bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8e2d8d16-3ee2-4e87-8905-c1ad2078e5ed/msi_h81m-p33_network_driver.pdf
    • https://s3.amazonaws.com/jukoxisojow/28875514543.pdf
    • https://s3.amazonaws.com/titugome/mac_os_high_sierra_windows.pdf
    • https://s3.amazonaws.com/bulikowexunepov/how_to_write_a_good_food_review_examples.pdf
    • https://uploads.strikinglycdn.com/files/b1b08dc1-6b53-4602-92fe-6709bc93b35c/tom_sawyer_and_huckleberry_finn_2014_english_subtitles.pdf
    • https://s3.amazonaws.com/loranoduzuja/80400779929.pdf
    • https://uploads.strikinglycdn.com/files/28f9ba5c-5c1f-4da7-8855-80bf5b6df9b8/dopidujote.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_off0000f122.bin
b0be43c8406858bcee777add5f188bbd8c3c3496e08fda0e792c2789b944e4a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 5072 bytes
font_01_sfnt_off0001024a.bin
3878dd4a7fe952658f44b780c6f2472c68f7ec7e1656c3c93331bbd684b5ab78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 10944 bytes

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