Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6e289f7f56fcee…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 22:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0af7b391231a71e8acee6f43b1590520 SHA-1: 223607a15c6fdf7226e6f16b8acf43177665aa81 SHA-256: 5b6e289f7f56fcee4899e8b023cc5ab80ac7f9935a4cb0f64fa8b44a5053a604
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, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful 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 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://xezojetit.ru/123?utm_term=job+interview+question+and+answer+for+maritime PDF link annotation
    • http://wirobigi.medianewsonline.com/ap_us_history_exam_review_video.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/16807613846.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/beneficial_and_harmful_insects.pdfIn PDF document text
    • http://tricitysikhs.com/cuantos_son_5_inches_en_centimetrospgzuk.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/xapitirefogixu.pdfIn PDF document text
    • http://003-center.ru/sherlock_holmes_1_bookxe260.pdfIn PDF document text
    • http://mananeje.66ghz.com/input_type_file_accept_image_and.pdfIn PDF document text
    • http://beautytopshop.site/sportspower_my_first_trampoline_instruction_manual0d3re.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_c26b3027a05b4c85b713810520ecf9f9.pdf?index=trueIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/vufubemisekuwewetisigag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413f6fe1-41a6-4f3d-a363-ab83903bde2c/73134919757.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_4a62c4adc703417aaaf173f2b0a74c37.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_89150eb5a0364af1a0ba30ea1058131b.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_92c4785b160b483f8d8c292e7022db70.pdf?index=trueIn PDF document text
    • http://rawopewudoj.rf.gd/mahabharat_krishna_bansuri_tone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36aa923e-3ba6-4be4-ac35-4c77cbb77ad2/fufozobedizimulum.pdfIn PDF document text
    • http://puvuxidaw.epizy.com/79632607804.pdfIn PDF document text
    • http://gamugeko.rf.gd/jamosuposetelodilosik.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_off0000f1c5.bin
53b155f97bae77b3102bb96998cd996bf28f40d7bf21f9d49d447679b1100a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5428 bytes
font_01_sfnt_off00010436.bin
7bfeca76dab7fcba08d9e1e774512f5296039d1f47e716a5335765aeb36289b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 10688 bytes

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