Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed5f754dff1c6ae…

MALICIOUS

PDF

80.8 KB Created: 2021-04-18 13:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23d8a6dda25d26fc297db6353661f854 SHA-1: b1072176c65b0b1c2778868736e7086961522326 SHA-256: 8ed5f754dff1c6ae4edf7a25dae50662dec3ab1697c042e75e86bf0d7fb96357
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://nipisod.ru/strik?utm_term=magic+bullet+party+cup+size PDF link annotation
    • http://wemuwetafivaxe.sportsontheweb.net/honda_gcv160_mower_parts.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/diablo_2_remastered_june_2020.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/bertolt_brecht_vida_de_galileo.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/reguzowof.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/toletivi.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/ccc45cf6-2866-4a77-b199-b9b7f050b3e1/how_much_do_starbucks_baristas_make_per_hour.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/katosomumotalakapejorar.pdfIn PDF document text
    • http://tibamupebunod.atwebpages.com/52408619738.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/combinational_circuit_design_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/66506107370.pdfIn PDF document text
    • http://zifokorakimedak.rf.gd/rexopedejewivum.pdfIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_b5598cfa08294284bca9b6e6b60c7d2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e1b087-07ac-4b64-bb55-300402b484d4/1091641966.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_061501022cf5469f88e7f49ab54f2dcb.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_5c1344c134834ee2955d6e39a8250d98.pdf?index=trueIn PDF document text
    • http://jatowikuv.rf.gd/70846396476.pdfIn PDF document text
    • http://fesemuk.rf.gd/43491617687.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_aa81c6c3edb14cdea50f4399bac28634.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15754377-00a1-4bb2-b593-bf90b06f1fb2/besorilati.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/27834897429.pdfIn PDF document text
    • http://dumojofirokagud.epizy.com/65799513133.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_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 5400 bytes
SHA-256: 9fd3c44b487f76cf3f95d5eeb02b2d221d8683a3e5e3fe7ddd48c5689f021e80
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 11620 bytes
SHA-256: 5d3a1b70def0f2a1e2be37c667ecb1fe153f9ad8e4d135a3cb8296ecb2a27054

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