Malicious PDF — malware analysis report

Static analysis result for SHA-256 346bd8eb4244e9cc…

MALICIOUS

PDF

60.2 KB Created: 2020-11-22 01:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c2d4a3c9a2d7c34e0ad5961a9791448 SHA-1: dc9c57700e59a1d23f920fbe4b39d86bfaf0f5a5 SHA-256: 346bd8eb4244e9cc903b601182efb12431c71f80c05e327a985d48516c1d976a
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to an 'answer key'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=improving+vocabulary+skills+answer+key+chapter+4
    • https://cdn-cms.f-static.net/uploads/4443588/normal_5fade1ad9149a.pdf
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fa83df23a794.pdf
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5f8c212a3d113.pdf
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5fb98e8611ae8.pdf
    • https://cdn-cms.f-static.net/uploads/4406213/normal_5f9a73e771f37.pdf
    • https://cdn-cms.f-static.net/uploads/4449419/normal_5fb98f6f1e0a7.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5fb3b6a6d9134.pdf
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f9d8f2c47336.pdf
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5f8e01dd729cf.pdf
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5f9ff029cd88e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8b5f18a-abd6-4e21-96f4-4dfe088e03cf/head_soccer_championship_2019.pdf
    • https://uploads.strikinglycdn.com/files/0944b53d-7e2c-4c1e-9af1-51dc53708278/spirit_world_dimension_minecraft.pdf
    • https://uploads.strikinglycdn.com/files/a4f724e7-2332-4cab-9dcc-4d7a0cb25fa8/pavewotosevoso.pdf
    • https://uploads.strikinglycdn.com/files/86bb00ad-1101-4255-b918-c61b2a693983/99606023599.pdf
    • https://uploads.strikinglycdn.com/files/c4e27350-2c85-495e-b032-30e2c7aeefce/5102344457.pdf
    • https://uploads.strikinglycdn.com/files/03d9a2f8-6506-48f0-b6e3-5c15794212af/espacio_muestral_de_dos_dados.pdf
    • https://uploads.strikinglycdn.com/files/244dfb64-d4f4-456b-a7dd-ae44d227ad82/69250994189.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afac.bin
84ac18a3671ee6516c9475779428ebfc8e94657642e7443f5ec1eb0086755190
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 5828 bytes
font_01_sfnt_off0000c37e.bin
331ebe6cb510c953bd0269b96c88ae1dd1db726a76c4e9e30e9b707a6e35b9b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC37E 9360 bytes