Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ef7d92d7c748fd…

MALICIOUS

PDF

70.6 KB Created: 2021-03-30 07:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9d190e2d4f0f5468788fa175f2678f SHA-1: 7b3241183196aae6ea5889784298bff6aab70962 SHA-256: 40ef7d92d7c748fd719e560eca697918dc96e09fe7de686f162d2166af73f60f
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://vilenefex.ru/strik?utm_term=how+to+work+a+wolf+gas+oven', suggests a phishing or scam attempt. The presence of numerous PDF links, including 'https://cdn.sqhk.co/redodadix/mgem7gj/begalezowademesapo.pdf', indicates a coordinated effort to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+to+work+a+wolf+gas+oven
    • https://cdn.sqhk.co/redodadix/mgem7gj/begalezowademesapo.pdf
    • https://cdn.sqhk.co/moxulofilose/7nOgi8o/depokipuzufinunazulugeje.pdf
    • https://cdn.sqhk.co/zebekufalafi/hb8hhb4/android_10_beta_samsung_s10_plus.pdf
    • https://cdn.sqhk.co/wovudojemu/xihjbha/sivulevemawijejawuzi.pdf
    • https://cdn.sqhk.co/fekigimuzib/jFhj5Pb/nepiviwisedibapeju.pdf
    • https://cdn.sqhk.co/mamidusidozu/6y4jhii/81986330796.pdf
    • https://cdn.sqhk.co/rovonoset/5uichcJ/expansion_of_roman_empire_map_activity.pdf
    • https://cdn.sqhk.co/notenirikev/pwKjcid/electric_screen_sim_simulator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_64eabe30a18e4220ac69a5f99ea70e6d.pdf?index=true
    • https://s3.amazonaws.com/latufenaw/61436739305.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/9666252315.pdf
    • https://s3.amazonaws.com/mejados/68503347422.pdf
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_35aed2c11c85421b8024c0c37653e7fc.pdf?index=true
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_65904b1e14174efbae1975065c7bde31.pdf?index=true
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_a36d1b5872f64caaa4a9714d14b68939.pdf?index=true
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_e2387219fd8d40478632dff839fa12d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ca5d64ee-5359-4f0a-946b-6a27a22e613c/limevapoguzajefomo.pdf
    • https://s3.amazonaws.com/fidefofudi/usg_guided_superior_laryngeal_nerve_block.pdf
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_0d4c1611fb7b4a2ebf3d2aec3b9b46bb.pdf?index=true
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_0a224b6a51d44f93bdcab5654bbf4271.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_373b1c98294a40efa177e707fbc4c0fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6f6be263-44c6-41df-a7bb-5f6fd50f528b/93137745220.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_off0000d805.bin
813a28def1ff669cc9fb73c7eb9a36c659e9fee5334cc7ec1ec289d429e44523		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 5112 bytes
font_01_sfnt_off0000e997.bin
e0d674b0c2172faf86b37eefbc7d680bbadbc6a4fc129ea98bf1b302dc169f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10376 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.