Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5a75a4ff830d46…

MALICIOUS

PDF

66.2 KB Created: 2020-12-19 09:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aec4b3de03ea3697de541b0adc3ab44f SHA-1: 14e515eca6a2b72ce13d85644e473bac805ad8e9 SHA-256: 6f5a75a4ff830d46b547c2ff76f3bc8b7dcec386a3ca2184d55f782bafb1ab2f
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URI pointing to 'traffset.ru', which is a strong indicator of malicious intent. The PDF structure itself appears to be malformed, with duplicate object bodies, further suggesting it's not a legitimate document. No scripts were extracted, but the presence of the malicious URL is the primary driver for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=best+friend+50+cent+ft+olivia
    • https://static.s123-cdn-static.com/uploads/4380545/normal_5fc513b772b97.pdf
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5f9c0441cadd1.pdf
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5fae00baba70c.pdf
    • https://cdn-cms.f-static.net/uploads/4479223/normal_5fdb3fcb9496d.pdf
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5f965c6508bca.pdf
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5fa761309b000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b81dacbb-8b43-4901-af55-0be08c43e3f3/borefinoderufazawe.pdf
    • https://s3.amazonaws.com/tupofelasujewas/kumazirerirevogile.pdf
    • https://s3.amazonaws.com/tadovu/17516933479.pdf
    • https://s3.amazonaws.com/jofunoje/anime_with_dragons_and_magic.pdf
    • https://s3.amazonaws.com/bakoloj/duke_of_weselton_ouat.pdf
    • https://s3.amazonaws.com/dadupawo/wuzimowitamofujur.pdf
    • https://s3.amazonaws.com/nefunupu/greek_to_english_bible_translation_free.pdf
    • https://s3.amazonaws.com/dazovosugev/90983240709.pdf
    • https://uploads.strikinglycdn.com/files/b1082c78-4eb6-4286-b5c1-4b08432d0760/44975788962.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_off0000c587.bin
b74897b241082b38f75f2264ac09d1a6017de63b7a6380705a4b4fdd94ca207c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC587 5392 bytes
font_01_sfnt_off0000d7fc.bin
5a55cc9ad678c8424f8654ada592bb8500622cfe8166ea4c7186e85e2ed1b3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 10672 bytes

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