Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea8ea175c538a14…

MALICIOUS

PDF

72.6 KB Created: 2020-12-20 06:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6be5a7fef1abf82a5a9ba45c1f8c4eb3 SHA-1: cd7215c29d5b67d1f47ee18cc208566ceb4e84d8 SHA-256: fea8ea175c538a14be80a88eb05eecf977e6e1c35a4a3253fac3a80d0fd866c2
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as potentially malicious and flagged by ClamAV. The document body, though heavily obfuscated, references 'Armored Core 4 answer iso', suggesting a lure to trick users into visiting the malicious URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=armored+core+4+answer+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5f9cf6b66f650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_5fd17155dfced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_5fb3fccfb651c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fbc6146dca82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5fd6538f49970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f8742ef49896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5fa330c145448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f88fe040fe0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5fdc019d19835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_5fb9fa431771f.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://s3.amazonaws.com/sumesawoxajew/sukevewarive.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/69471567327.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/8633685187.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/38253192670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb9f879-c784-46a3-9ad5-04a66cd00d0d/bloodstained_ritual_of_the_night_mod_alucard.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/organisms_that_reproduce_asexually_formed_spores.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_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 4928 bytes
SHA-256: 1caf0769a943583474f437f9e1f6640490a232e4281895dc2b745e8e65cce09d
font_01_sfnt_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 10696 bytes
SHA-256: c026114432f6afdf528a4fa8e3a2abedc85256d87ba2fd428b93ab56233d388a
font_02_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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