Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ca6c4e05aa858a…

MALICIOUS

PDF

90.2 KB Created: 2021-01-16 02:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bc996b8df63aca5c87ffbec98dab07a6 SHA-1: e62bda5f533f1aafd0db54c7dacd15daaf22d51d SHA-256: c8ca6c4e05aa858ac8234f2f90e9313c09437aec9bb013f01d278574d0c99099
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by ClamAV and a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to diet information, likely intended to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure and URL are strong indicators of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=belly+fat+burning+diet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5fd7793436d1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fbe7be791ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fd66a2e217b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_5fe654382964d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f88532d77322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fc81443ad0ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fab2d39dd4e6.pdfIn PDF document text
    • https://site-1177129.mozfiles.com/files/1177129/stormfall_saga_of_survival_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5fffa578ed029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5fcb10df85469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5ff985ad50f89.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/sesijesule/all_tv_serial_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/87673867270.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_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 5320 bytes
SHA-256: 4cd5c4961663d5e9d044ce8f82e7db72faffff904066789319d18756aaa58e1b
font_01_sfnt_off00013910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13910 10232 bytes
SHA-256: 435332ac0aed5665ca9124241e26d23548455a35f573643129338263f9ab5820