Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1539ce1391612ad…

MALICIOUS

PDF

88.4 KB Created: 2021-03-20 19:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8633f44a6618f59322cc266d0edf3073 SHA-1: 53057e01855b9e3d49ce1e9a89a464180b1b3967 SHA-256: e1539ce1391612ad77977408e2f52f5542003272e5d5c98ea0c3702a7b61c371
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/award?keyword=carol+of+the+bells+piano+sheet+music+pdf+free PDF link annotation
    • http://gejokakop.mygamesonline.org/jikelikedamopukataridab.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/english_to_japanese_words_translation.pdfIn PDF document text
    • http://susekilimu.medianewsonline.com/xizat.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/70703707183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_601c01551df3e.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/poluduzusajezi.pdfIn PDF document text
    • http://gidonuvawugirid.medianewsonline.com/jujasozixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486192/normal_60082d0fa461c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_15ba32e7880a407398c5570a5eb7b1f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxegeza/inverted_pyramid_press_release_template.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_635a591d76fd4f36b69e5fc5cb1e9599.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/606846e0-ec34-487b-8991-5d6313dc8804/bowflex_pr1000_accessories.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_f3794ca09f9447a8b2ddbc7c70f16847.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17e8f54-09d3-465f-beb2-8f5b2ffa61d8/786958778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16cf51c-8cd8-4e9e-8d41-e6f1bc8ce871/kijukekoxejoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4490d80-3654-45cd-8cba-d0591fa05961/dyson_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/xamatadumubexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819d9ab4-86f8-4ff3-92cd-1336537300b5/9732214907.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_aaa9b0717cb348e19fa3ad9d90306d8b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 5440 bytes
SHA-256: 92b2e9f7643c1dca3b4c056b1049298cd25f1e7b95a8851e80c8f87be534381b
font_01_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 11736 bytes
SHA-256: d5e775f0de7b023dd94c6ba199cb78b69d5ecb2d4a67a4293247e3686e5325d4
font_02_sfnt_off00013f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F51 16100 bytes
SHA-256: 9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249

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