Malicious PDF — malware analysis report

Static analysis result for SHA-256 984368a6b677707f…

MALICIOUS

PDF

74.1 KB Created: 2021-02-24 11:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6fafbbbd98df5a14154484a24d33b32c SHA-1: dbb2c0eaf04090c9c4022774ebcea7e0cfe1897a SHA-256: 984368a6b677707fe9854ad374e7eef34bcac323b479bdfd2eaf6a7a6949b18d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'seumenha.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest the PDF is designed to redirect users to potentially malicious content.

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://seumenha.ru/strik?utm_term=how+to+turn+on+hp+probook+6550b PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465147/normal_6034444c341b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fc8649c64549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_600a65724bd87.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/bexarediped-kosunanusufomu-fofebib-wopare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_602da413c751c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600aeebd5f86b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fcfec6ad46d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_5fd9b0fc8a2cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://punafifa.rf.gd/18778385377.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/biperideno_ampola_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/best_spreadsheet_for_monthly_budget.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/452832121.pdfIn PDF document text
    • http://suzowow.rf.gd/simang_bodo_song_free.pdfIn PDF document text
    • http://kevulapoxokimif.rf.gd/17191726386.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/sulok.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/uk_guidelines_liver_function_tests.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 4880 bytes
SHA-256: e2d21ee3a32f16bf1fa21bb4a4d8be6e9e843a371e10644dc37a5cb61728f2d0
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 11708 bytes
SHA-256: 9d1e53cfa8215b346a7faa5d0ef457b54cc6d5b8ce6180b45e6461b7cd1761f1
font_02_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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