Malicious PDF — malware analysis report

Static analysis result for SHA-256 3600684bbd8b94bd…

MALICIOUS

PDF

65.3 KB Created: 2020-11-21 07:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 62ba42c85e6d926b41eeee575e5e0054 SHA-1: 928dd6d06246611ffb05c5fd967c167cea4bd936 SHA-256: 3600684bbd8b94bdf7a1a9212415a47769b52f91f10e3b96fdae1dda5ae74711
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI pointing to a suspicious domain, which is also listed as an IOC. The document body, though heavily obfuscated, contains text related to downloading an emulator, suggesting a lure for malicious software. The ClamAV detection and ML classifier further support the malicious nature of the file.

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://trafffe.ru/123?utm_term=download+my+boy+emulator+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494140/normal_5fad5cb09f751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8751aa37682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f977bd46f6c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_5fb2b6938bda3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_5fabf4e09652c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5f9c578085c51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisazabe/what_does_fha_insured_escrow_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1f624a-958b-4b08-8e4c-5199941f1263/walworth_animal_hospital_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdb0bec-9622-4903-ab3b-e3e040f3ca98/56205601288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dec2d8b-992e-492c-9392-861d45c00140/sekuvusopazozepefox.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/11776676001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8df5be0-4419-49c7-b6ff-f2a7d545a87d/fortnite_download_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2a869a-2145-4633-950b-e10f65f92f6b/1668635052.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_off0000c33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 5324 bytes
SHA-256: 18541e94d60ca8347170ec04d140a97dbf8c71288c8dddb456fa33f2455a5433
font_01_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 10308 bytes
SHA-256: 18690b24e79d80fab1edd2735c64a23193d9d07e85730ddc5dc4f4c906f72540