Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa36e1a353f6569…

MALICIOUS

PDF

76.7 KB Created: 2020-11-23 06:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6ed84386d6997a1db7cf9d842147bc20 SHA-1: 1d543f64a5eeb3626825c20a10df3634ebd7bd82 SHA-256: 8aa36e1a353f65692ae44746cef4d7120905747aa91ac4d82105c905ad3d69b7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL, https://trafftec.ru/aws?utm_term=occupational+hazards+for+nurses+pdf, is identified as a redirector for phishing. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest an attempt to deliver a malicious payload or phish credentials.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafftec.ru/aws?utm_term=occupational+hazards+for+nurses+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482027/normal_5fa7e843178a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fb2ad393fb4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f86f42213348.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/45fe56a9-d9af-4c05-afe3-73119499900a/72803298408.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/what_are_examples_of_non_material_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0258821-b080-4f35-8b99-624a3b0f45e3/modulos_de_repeticion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80453717-f2e8-48b2-9afc-2b5e03c338bd/27359042580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca982f6b-86c6-477e-9d5e-114bd7ee9c01/sotufuxojedolemakuk.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/liras.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/google_drive_batman_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/pdf_to_word_converter_software_free_download_filehippo.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5320 bytes
SHA-256: a2374a27a3c3179fd6467ca3af21a91327460e3a9953bd95d7016f7ca1caa720
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 11056 bytes
SHA-256: ddbe7509f2a6ae294fdc12fab7e8f5e2fbadd515843d0e557333401a00d8785d

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