Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a832ef80477a7c…

MALICIOUS

PDF

132.2 KB Created: 2021-01-30 02:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d0cd3c1dfba501c4d2b09110336287c8 SHA-1: 416391765b0e4f8b10a61c1de9f023401e16fad4 SHA-256: b4a832ef80477a7c948b5d6d2d4d917a7140970c6b3457d570be3515ea04975e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF content, suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/wb?keyword=phage%20medical%20terminology%20prefix PDF link annotation
    • https://pakupefo.weebly.com/uploads/1/3/0/7/130776676/34e3a0b1.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/judazuwoxoxisef_mipiwufumis_figifobutukino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5fd0afcb01155.pdfIn PDF document text
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/379769.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/2668151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_6001d771c105d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_60072f66e44ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5fd7d3a06ee40.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/guvawaloful.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/muvazi/22440691747.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/memento_mori_korean_movie.pdfIn PDF document text
    • http://fobapisarut.epizy.com/compass_directions_and_angles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/ielts_writing_task_2_samples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/wedej.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/bandicam_untuk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/compliance_risk_assessment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/geology_rocks_equations_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/best_cheque_printing_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/basic_information_about_digital_circuits.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_off0001b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B400 5564 bytes
SHA-256: af2a7009067e15edf8bbb1f18253522a157a0cfdcab0eccd6fca9663bdc294eb
font_01_sfnt_off0001c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6D3 23760 bytes
SHA-256: 979a877e95d7fa1b1d7dbfd6797df4faea43f77cc512ec420c23393a20f4b68b

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