Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6b554b4ba0f288…

MALICIOUS

PDF

68.3 KB Created: 2021-06-09 03:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c1ef58d7fd00707710e620a72437e777 SHA-1: 80259a8f4b6ada2b2156033a0988a7d8fcaf1959 SHA-256: 3f6b554b4ba0f288ad22feedc6b62da7c9a2f83af8355090caebd5f6b1d283af
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 a heuristic indicating it's a phishing lure, specifically using an image to redirect users to a URL that promises a 'battle royale game online'. This URL is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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://crysiq.ru/pbw?utm_term=play+battle+royale+game+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449602/normal_60b8d577d3c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_601916343b0e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403143/normal_600131a67ba4b.pdfIn PDF document text
    • https://nulosomeka.weebly.com/uploads/1/3/4/6/134605351/dolinosobimem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_605d66ce24bc9.pdfIn PDF document text
    • https://dotodologeviron.weebly.com/uploads/1/3/4/5/134513902/325c61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_60067f7f6950c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ffa51e3099f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5ff2493a9e529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6029f4fa70317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_600b2cb1b9b3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_6000763a1e6ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fcdacc2b3d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_6063e4d26f6bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/83721dff-67b8-41f2-af3b-d76395dc4b56/83897243107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a67aea-11f1-4eb9-b952-b5a4b42a7e0c/basic_engineering_circuit_analysis_10th_edition_solutions_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f83a70f-1fe1-4ad4-850b-2c3ab602908d/53887991250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fa865b-6c80-4e23-a318-30daf0c9b009/acceptance_and_commitment_therapy_books_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39453a4b-58e1-4b70-a9ab-b43ebe98a920/constitution_of_nepal_2072_in_nepali_date.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 4856 bytes
SHA-256: 5a6f42429116f794675e89aea5c19ea3781e6c2e7f554a9adcf75b2ab11ea15e
font_01_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 9732 bytes
SHA-256: 74b40e60bd67994f6e266bb8d7daf41741b73d1c3e399fbf4768f7deffd03551
font_02_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.