Malicious PDF — malware analysis report

Static analysis result for SHA-256 41978974e5bfa450…

MALICIOUS

PDF

120.0 KB Created: 2021-03-28 09:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7775374c62a07183fdc795e40c8d6648 SHA-1: df53403becc99264ecb1b1c4b580b1a9be79de7b SHA-256: 41978974e5bfa450cef0999dc6ac33250f7ea326d64a367be7dd1ceeee885479
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to domains commonly associated with hosting malicious content or phishing lures, such as 'xezojetit.ru' and 'wemezixogasowed.weebly.com'.

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://xezojetit.ru/wix?keyword=chapter+1+cumulative+review+answers
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/93db7.pdf
    • http://lazezubeb.22web.org/agile_software_engineering_process.pdf
    • http://zakugajogaz.iblogger.org/abviewer_to_dwg.pdf
    • https://cdn-cms.f-static.net/uploads/4415051/normal_605994eee0b59.pdf
    • https://static.s123-cdn-static.com/uploads/4475864/normal_5fca2e2488d09.pdf
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/ranemuwaxit-wojexuwe-kebowazo-vetuzogevuxin.pdf
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5ff8583c7ea7a.pdf
    • https://cdn-cms.f-static.net/uploads/4408707/normal_601eb54f68bd9.pdf
    • https://cdn.sqhk.co/kuruwoke/iKOvgib/red_robin_locations.pdf
    • https://cdn-cms.f-static.net/uploads/4417523/normal_60273e89e7538.pdf
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/7110575.pdf
    • https://cdn-cms.f-static.net/uploads/4487184/normal_605d982303aa1.pdf
    • https://cdn-cms.f-static.net/uploads/4421787/normal_602ac16b42472.pdf
    • https://cdn-cms.f-static.net/uploads/4458413/normal_603e604624428.pdf
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/2138ca3e0.pdf
    • https://cdn.sqhk.co/zelosoza/MnHjh7I/20984782637.pdf
    • https://static.s123-cdn-static.com/uploads/4425913/normal_5ff54713a2568.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://paravewufazik.epizy.com/fosutigupofopef.pdf
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_1baa73ce79e94ffbb235af8dab3d685b.pdf?index=true
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_0a5cd3c70fe6474a846d1003ef5f1a25.pdf?index=true
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_53a3cac619e049d1ae24e30d524d8179.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000189e4.bin
8e696e50b7aa479b433290210b589161c657994e2f24945b313cce57ceee973b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189E4 5284 bytes
font_01_sfnt_off00019bbe.bin
f0ff346b00c63b7b23f02e7fdc9ecf3ce88a4ebab6bfbc7eee3b0a0366b9334f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19BBE 3164 bytes
font_02_sfnt_off0001a86d.bin
896cbc98daae331eaed0eadf78e2b7bdad5271866b84e501ac2863cd06ece166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A86D 12324 bytes

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