Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f930e8ef5a2422…

MALICIOUS

PDF

80.2 KB Created: 2021-05-29 17:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06a5dbb9f1dea82e08517d0ef9c4ac0d SHA-1: 8b623e9695f3877c8234a35ad9207684498e7583 SHA-256: c9f930e8ef5a242282c735e42af7f1bfdd6f22ef6d762763159996d570aa55d5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with a critical heuristic identifying a PDF link farm. The primary malicious URL identified is 'https://soxebez.ru/wb?keyword=wd%20my%20cloud%20ex2%20user%20guide', which is likely used for phishing or to redirect to further malicious content. The document body is heavily obfuscated, but the presence of external links and the PDF structure suggest an attempt to direct users to malicious sites.

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://soxebez.ru/wb?keyword=wd%20my%20cloud%20ex2%20user%20guide
    • https://daxixerok.weebly.com/uploads/1/3/4/0/134000062/sesexegudubate.pdf
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fc900af3d695.pdf
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5ffab1a7c18bd.pdf
    • https://static.s123-cdn-static-d.com/uploads/4381751/normal_60b1e4a13687a.pdf
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/pekigofezokavo.pdf
    • https://static.s123-cdn-static.com/uploads/4458838/normal_5ffd72ee3d9d3.pdf
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/rotikuz.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_602e6e6fb567c.pdf
    • https://static.s123-cdn-static.com/uploads/4475000/normal_6006d3e41c2e6.pdf
    • https://vorusasu.weebly.com/uploads/1/3/2/7/132740845/pegovejumedaj.pdf
    • https://cdn-cms.f-static.net/uploads/4466166/normal_605aaf339fe89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/908c8a0e-6d82-427a-8121-d1c3379ec517/what_is_the_meaning_behind_the_phantom_of_the_opera.pdf
    • https://uploads.strikinglycdn.com/files/e44cd706-2b50-4c25-bbc9-8bf06df8dc7b/11704038696.pdf
    • https://uploads.strikinglycdn.com/files/82acd361-3395-4683-8c5d-b0a6cbaac4e7/12490376198.pdf
    • https://uploads.strikinglycdn.com/files/dcbebeac-e201-459e-a337-bbac9f9df954/how_do_tempa_dot_thermometers_work.pdf
    • https://uploads.strikinglycdn.com/files/9be7a318-980b-451b-b212-c6c7e1e34235/vidmate_download_for_pc_install.pdf
    • https://uploads.strikinglycdn.com/files/8f9eaee4-5597-4a9d-bcfb-ed28f20d8023/what_is_dynamic_security_in_prisons.pdf
    • https://uploads.strikinglycdn.com/files/31708bf3-7261-4f27-b0c1-a2c9797875f8/what_programming_language_is_used_for_python.pdf
    • https://uploads.strikinglycdn.com/files/28963931-272e-4964-9283-94eb2134658e/how_to_setup_a_universal_remote_to_a_dynex_tv.pdf
    • https://uploads.strikinglycdn.com/files/3539f26e-3d22-48e4-833c-ad353ea34b76/diwufufajekalikonepigifo.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_off0000f7a8.bin
97a70fb6bbbf343077427ceef1f924ea19d7be792cdd591cc8c24755d9b96dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 5364 bytes
font_01_sfnt_off000109f0.bin
4e65a476fe9bc7f5979c64bd573ef3f982729ab5dbbe7ddee579cf369d5fc9eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 13516 bytes

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