Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0a4ec0c60b26bc…

MALICIOUS

PDF

79.1 KB Created: 2021-05-22 09:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 692746315e9cef77152b568e1a3f6797 SHA-1: dca35aa49372e2526ad0286c38b0460064f14b05 SHA-256: de0a4ec0c60b26bcfe2ae51a569218ffba5531135d2e540ffcb2916fbb262f35
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, a common tactic for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one of these links, 'https://pelibifir.ru/strik?utm_term=how+to+combine+multiple+sheets+in+excel+to+one+sheet', is directly embedded. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to Excel functionality.

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://pelibifir.ru/strik?utm_term=how+to+combine+multiple+sheets+in+excel+to+one+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404964/normal_606319643ff22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_602800fb8d26d.pdfIn PDF document text
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/lutobupapejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fc9cbb129480.pdfIn PDF document text
    • https://xepuzuzolewu.weebly.com/uploads/1/3/4/3/134324818/3451236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_6031daed0a61e.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/d370bb0d-f38d-4bac-bcdd-cd71c1f6964c/78232552409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddb2678-b9de-4f08-a539-9d2f7b287752/3042436289.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/fudexexekajasiwozezirut.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/fojaduvuxadatidoge.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/78319662399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e8c222-1c93-4a58-a819-5f9325953511/43691692329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9488970a-4773-4a77-a227-1e78302b37f0/hec-hms_system_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ac39b9-04e5-4fd0-8afe-f0cec3124b86/bibusakinimolowaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f82f304-7bb0-49eb-8f4d-2da060deb6a4/sylvania_model_sp258.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/nuxatawuwogumisuregano.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/latex_beamer_documentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b211468d-5a8c-40ca-a4c3-a33c26c83b55/does_walmart_accept_ebt_for_delivery.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/zojaxuruxutimuz.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5128 bytes
SHA-256: 974628519fd762a532221441efe5235ebedd2f8e744bc65dbf6beaf4549952e3
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 11792 bytes
SHA-256: 1bcd0cc388f5b58efa285479d4770cbd67127c90d7bea18bf0a05f42f091e1b7

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