Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88e99993beebcd7…

MALICIOUS

PDF

62.6 KB Created: 2020-12-31 06:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: daf473fda6662166ccbd7b0ca5106f48 SHA-1: 94baf6041aeb15f43980fba84f02911f4ceae2c8 SHA-256: d88e99993beebcd7cc56a4cab1ddff2ca3ead57036f1eb33a09802b4e408dd02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://traffnew.ru/123?utm_term=jessie+and+woody+baby+costumes', which is flagged as suspicious. The ML classifier and ClamAV also indicate maliciousness, suggesting the document is designed to redirect users to potentially harmful content or facilitate further exploitation.

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://traffnew.ru/123?utm_term=jessie+and+woody+baby+costumes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fa17213df635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407991/normal_5fa1ecf8cf0d2.pdfIn PDF document text
    • https://venakadu.weebly.com/uploads/1/3/4/7/134729608/f1762dee6cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5fbb267dd20a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fa16ff5c2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_5fb2fb325a18f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f9109b21ebec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_5fc27dee24395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonebon/blogspot_template_simple.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/15709652985.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/employee_recognition_award_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/dunaziwukopodoluvibef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f1f33c-4a3d-4bf3-acf5-389a53c66a96/70909950112.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/health_and_safety_management_system_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/standard_double_bed_sheet_size_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/jezokutuguv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68E 5280 bytes
SHA-256: 2c4bcb368397614ddf346ea9b45729fc305b989bab86fba533c4c30c978b82ef
font_01_sfnt_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 10392 bytes
SHA-256: 9482675b5b62fb076c1c907591aa640cb46dbeaa01057fc03866ec18405d577e

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