Malicious PDF — malware analysis report

Static analysis result for SHA-256 566a6313fbc452aa…

MALICIOUS

PDF

69.1 KB Created: 2021-03-21 22:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8de62e18596ca93a21221d3ecd705ca6 SHA-1: c7fb1c33dc3a8c4fb77ea2232a751e1eb6041587 SHA-256: 566a6313fbc452aa8a446f25177f376f96848b18d4a4262b4de308f1905acc9b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains embedded URLs pointing to suspicious domains, including one flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. 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 0.9998

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://jumiwimov.ru/123?utm_term=direct+object+pronouns+spanish+2+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485801/normal_600e42428c3af.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/4976034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_603ee41cbf478.pdfIn PDF document text
    • http://sidikapefujuxe.22web.org/fotunevumubigikopagubexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_60421960ae220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_603eaef41457f.pdfIn PDF document text
    • https://jilolepileg.weebly.com/uploads/1/3/1/4/131453494/8552536.pdfIn PDF document text
    • http://depepuxuri.22web.org/97917801722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibodezoboro.rf.gd/61197241578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c908e16-74a3-4b51-b03e-2770745c9ee8/jlab_wireless_earbuds_not_working.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_dda5121a0e124c7eb50d1f511d697ab1.pdf?index=trueIn PDF document text
    • http://mojilobopage.rf.gd/medical_devices_health_canada_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45939569-e8a9-42e5-9c42-9d9a687438f3/is_there_a_calvin_and_hobbes_movie.pdfIn PDF document text
    • http://bavunetaxigapi.rf.gd/79619885529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10dcd7a-8402-4a32-a567-3cbce34dfd80/how_do_i_change_the_thermostat_in_my_fisher_and_paykel_fridge.pdfIn PDF document text
    • http://varosuvavim.epizy.com/ladakakerugemovobunegizem.pdfIn PDF document text
    • http://guxudapese.epizy.com/petsafe_wireless_collar_not_working.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_d66c21fd6c7b43a4bd1de42740aed501.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9c53f6-e6d8-4ab7-aeae-5ecda0e10f4b/74698392596.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_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 5492 bytes
SHA-256: ef74f5228bf1e51fd96808e72cf1ccca34731f3d3137f1e4df4f8bb2d8214b8d
font_01_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 11744 bytes
SHA-256: 2359fbbe3adca5fa0663a358883c34e05dff2ef3f5a09dacca2a6efa52d46005

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