Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5b1c40b6899a9a…

MALICIOUS

PDF

75.4 KB Created: 2021-05-06 23:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369d81eefebf946a9b5a666585873579 SHA-1: 739360dd24a22136696d8d599399639027873339 SHA-256: ba5b1c40b6899a9acbbf38418bdfc54f7031ad3e56c8cb56dd51aec0d8fc7e55
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external links, with one prominent link pointing to 'jumiwimov.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be generated content, likely intended to mask the malicious intent.

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://jumiwimov.ru/strik?utm_term=does+the+keurig+k60+have+a+water+filter
    • https://cdn-cms.f-static.net/uploads/4380858/normal_6024a8f39a1ab.pdf
    • https://cdn-cms.f-static.net/uploads/4490250/normal_6066d3fe2a3d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_f0113a0deaaa4ff9a7133c6ddd4b7f30.pdf?index=true
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_c98b4f4ad95d441a847833f98d7f783e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/247d0109-9bde-45be-b760-a58087de7e9e/diablo_3_necromancer_inarius_speed_build.pdf
    • https://uploads.strikinglycdn.com/files/ddbcc9d2-f091-4909-bca6-09a6e01a9ddb/99_names_of_allah_song_by_atif_aslam_download.pdf
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_fe0ca2177a344ddaa4208f0c95070bb7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d506325e-a815-4a61-bc29-140f64848c8e/mozotubufebijo.pdf
    • https://03234a85-d811-4a68-a1f9-f7315bf9ccb2.filesusr.com/ugd/079591_5dd03980fd1f453e86b81a741d5a5cf0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2dccebb3-85e7-4d27-9592-9bf9fe7fa277/vurutiwa.pdf
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_0660c21d03d64af386d097a64ea74f3c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/254e89b9-3a06-4f3d-8fd8-f3d3f20ebb8d/bose_companion_2_review_series_3.pdf
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_f444afb5f5f645489fe58f59ce5ddb74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85d05be0-955b-4d2b-a503-4eb96d6dd886/gipogupawol.pdf
    • https://uploads.strikinglycdn.com/files/ffdcd40d-40bc-43d1-afca-3600f9fe4ba5/alone_together_filipino.pdf
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_bbc0e8b4f71742efac48944e00c10cfa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f8558c9-9219-4e11-a0bc-d937cf4bc4a4/how_much_does_a_lifetime_cost.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_off0000e644.bin
629680c689d37b54ed440366c65e64c4b6fa72dd0485347a8cf6b7243092eed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 5540 bytes
font_01_sfnt_off0000f938.bin
38f3cd79ac95a8a45cbb077406954779a27b49f47aec690d496f7602fdfa4c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 11484 bytes

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