Malicious PDF — malware analysis report

Static analysis result for SHA-256 9840edb74dee5b18…

MALICIOUS

PDF

79.1 KB Created: 2021-05-18 17:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dc64667242794f39a64dd3cd0f71a98b SHA-1: 21a74b65df821635708b8d2086b7b1d880fe2e26 SHA-256: 9840edb74dee5b1809c1dc298fad14017425346b3802d0e20adb9bdae16a9927
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that promises free premium software, a common lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic indicate an attempt to redirect the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=how+to+malwarebytes+premium+for+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411691/normal_6000139f86ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505771/normal_604cdf9d3751c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fcaeb8d78db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_603a747417afe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_604ca6f031b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fdc71d5ad9d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ff25836f28be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_600e0d2479f94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd203e4-d703-48aa-b008-dddf42fdad4e/weight_lifting_chart_based_on_weight.pdfIn PDF document text
    • http://xixesasix.epizy.com/diamond_one_touch_video_capture.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/nomalupitezizegexexe.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/maths_worksheets_for_year_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/35381646674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20816948-3292-4ca2-b018-1b9e680ae5ad/zedewurotusadavewi.pdfIn PDF document text
    • http://wuponiz.epizy.com/critical_thinking_skills_stella_cottrell_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa813dc-6ba0-4c52-9fb3-cb0d2750fbda/zemudusuzasebur.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_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 5344 bytes
SHA-256: 4577c4002908f06d5597b86843ccd605af2554bb14865503028789c3e3c2948b
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 11464 bytes
SHA-256: 798bcc05c6d3ec9915bea327e3ecb50ac02ddf70f55fa559a50fad94516fd2e6

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