Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45cc5e87e1987cf…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 04:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0447af0d9da5b1c3a274134f3f98f300 SHA-1: b8abbee617a65008acf9b1e592760533007ff4df SHA-256: e45cc5e87e1987cf1c98a61304cd3ab8c21fd74e59b03ab93a1083228770bddd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs and the PDF's structure suggest it is a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/wix?keyword=what+are+disadvantages+of+sending+robots+to+mars PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500877/normal_604832c14f678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_60135cbc1c72d.pdfIn PDF document text
    • http://jujakivupas.iblogger.org/96349629829.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/tumamupenapax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fc8378275f90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5fcf2d871b722.pdfIn PDF document text
    • https://wisemawuperu.weebly.com/uploads/1/3/0/7/130738751/mukodetopar.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/a6633bafe811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478387/normal_5fe54d749311e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5ff64df709c88.pdfIn PDF document text
    • http://pakatisijelu.iblogger.org/vba_excel_macro_tutorial.pdfIn PDF document text
    • http://tajevis.22web.org/fetinularepepave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_601be0c18de9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_fd0b2b3e6e59456abc09bfa4bcb28a84.pdf?index=trueIn PDF document text
    • http://rovarede.rf.gd/mosogetolak.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_d509e38ff52643d9a1fbf452b19d4f2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/76541469612.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/31087160613.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/rugajogipufutojotakip.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/esl_complex_sentences_worksheet.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_e088bec86b98409a933c3706af13e1ad.pdf?index=trueIn 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_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 5504 bytes
SHA-256: 15adc7ff76e3c08596e990be259c2aa68639867b2fc193e62adc12de83a98078
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 9808 bytes
SHA-256: 19859d78e8cd1bda6cfa21bc434ec008a6e52093e2c0b06cd588df27783437d5

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