Malicious PDF — malware analysis report

Static analysis result for SHA-256 4858bf17c54c4ac4…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 20:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0d08ed33624d62c9885d5dd31684489 SHA-1: 03f37ee87f5225da90267b415f920a309f259239 SHA-256: 4858bf17c54c4ac4ad3031cb7eb1d973d8d4fdfa9db4062abb166374394e19fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, https://mezovuduw.ru/strik, is likely used for phishing or to redirect to a scam. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=where+to+donate+baby+gear PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475212/normal_6023a2cfaabef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5feecff5c75bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377936/normal_60323a6ae0078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_605321c402d9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_11a87a197ae64e03aaf8997a798326cb.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_55988b6b9b3e48519a961ab5401d07f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/tikexeferemojezeta.pdfIn PDF document text
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_ece5d1ad2d534a1b8152ddee12af77db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a81f2b-e57d-4b04-9cc6-4cc3b4516868/allen_bradley_1794-aent_manual.pdfIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_aa1c32c31dbf4cada8508ce8dfd5badb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46aab170-4265-418e-9ff4-1b329d51037d/mumulom.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/how_to_fix_e7_error_on_air_conditioner.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/guided_math_group_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8929ae4f-0a8e-456b-9f27-679d5e28ca8a/what_is_a_lateral_move_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/english_to_arabic_offline_dictionary_free.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_4eeafc9f7c0041b890d071f0345eb1fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1c2b7b-842d-4294-8e08-1fe09cf1ca49/six_sigma_interview_questions_and_answers_free_download.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_7b0c5ea272dc4d24baf4ea82ccb729de.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 5132 bytes
SHA-256: d7efb6e2ca1965c61d3f48dfb39c093ae855c6d1e8c71c048c9fdd9baf5a6dea
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 11220 bytes
SHA-256: 687b8023969436cff69d7a3f5c0b18559957af83aec049f0285c6a6f416ed727

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