Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a137090776b3656…

MALICIOUS

PDF

72.6 KB Created: 2021-04-04 15:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b484b3f92ff535e8df40e604340e9cdc SHA-1: b15e21decb0419fa374f31edeb841a7861d886f1 SHA-256: 7a137090776b3656b78b94a5686f7aaf3795b1df74305f20c8c8690758508ef1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While the document body is heavily obfuscated, the presence of external links and the overall heuristic firings suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://ponafet.ru/strik?utm_term=samsung+syncmaster+s24b350+specs PDF link annotation
    • http://vakotuwudar.22web.org/56136906425.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/wifukedot/object_oriented_programming_with_visual_basic_net_michael_mcmillan.pdfIn PDF document text
    • http://baromar.epizy.com/wuwuvobexuzeleneduko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24c78bd-e0c3-46c7-80c3-187c177237e4/pudopanufunom.pdfIn PDF document text
    • http://zamipux.rf.gd/babeduvorubimukawufowe.pdfIn PDF document text
    • http://renodiwug.epizy.com/nubaxajapiwujo.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_b40dffab615c4792844c228936bb276e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/79394103424.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_3415d9c8b87447d19b22aec44ed54ee2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/654983b0-34d0-405e-b261-621b8fc5a8d9/calendario_escolar_2020_secundaria_estado_de_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/66338678410.pdfIn PDF document text
    • http://dojirezanis.epizy.com/cambridge_primary_progression_test_stage_5_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/39397819373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f9a565-71d6-48d5-9112-ddcfe0ec9f52/paremubi.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/electric_current_class_10_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/andrews_sisters_3_part_harmony_sheet_music.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 6216 bytes
SHA-256: 0b0757f69b210155e46a17e1f04650505d296012930bf3db549139350f67c1e8
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 11932 bytes
SHA-256: caab2d5df3969b76e058bf6dfd8112596807f9e4c9dd4e9b11961e0efba8a4ab

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