Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98ee68152adab25…

MALICIOUS

PDF

79.8 KB Created: 2020-12-09 12:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e182197f92a2c6572cd06d04e8fd673e SHA-1: b803e9b54a81798148a8b25f31f9b320a9288de4 SHA-256: f98ee68152adab253402de97259ef08af02f384ed0dc360fc4c1168d43ed6ab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL pointing to 'trafffi.ru'. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffi.ru/wb?keyword=applicability%20of%20pf%20and%20esi%202018%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484639/normal_5fae9980103fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fba5d7e4d366.pdfIn PDF document text
    • https://gejipowuxenufo.weebly.com/uploads/1/3/4/6/134681439/mijupa_voderer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fodose/febipoviwegoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df3decc-621c-41d7-ba5b-c6991259fc83/77071865658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5fe4be-727b-4249-9f66-08d40b89560c/mipumapijutepewesibojos.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/devesavevonud.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/77728556679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188c5d79-c9bb-4a23-9db1-19f9944aa5f5/dupegigivisixuriroweg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2102fb5-36a4-4961-b7d0-95a0e456f265/xumefosojumitutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b7c0d9-d647-4562-9bb7-e60f6c7d3a8a/90930346386.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 5804 bytes
SHA-256: 573e4d7b92e46cdb69de18cb002257a9f8efb01600d83835672f47f3e4fc424e
font_01_sfnt_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 3720 bytes
SHA-256: 4f60b374cbf2a68c08ee4e6e5bd880b9285dc74a309ed42da0b9c7a2c0026502
font_02_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 11120 bytes
SHA-256: 686006a4e0f0a0049ed6e10e715d5c8e2664e6252d4596beee9c06f291599618
font_03_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 8544 bytes
SHA-256: 1f23117a23de5b9f6af4c9be3f6cdffded7bb5bf7ee9a8d1cde36b052f5746f7

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