Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bec6810bfc53f92…

MALICIOUS

PDF

70.1 KB Created: 2021-01-31 19:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f3dcc7efc9304736bca4b860d37c0f79 SHA-1: dafddd6fd55873d691e80ba778f575a7967136ec SHA-256: 6bec6810bfc53f92daf960afbb84c78ae1129bed8adbfbd35e36d58a7da6f97e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'jottigo.ru', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'accounting aid society careers'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of a phishing or malware distribution attempt.

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://jottigo.ru/123?utm_term=accounting+aid+society+careers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5ff18c17c9417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_6010f4252acec.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/1BoagKH/45314118741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5ffc872a40ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fdc6fd5eb748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ffbeb05da295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5fe0293d1bec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_5fd8753235185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_60154b4a1899b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/icXvhhP/definition_of_lmao_in_texting.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/ujfIKLt/create_a_list_of_sequential_numbers_python.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fc858eda7498.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/ganubifirigevi/57846457791.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/forms_of_energy_ppt_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/47413331755.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/chakra_yoga_anodea_judith.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_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 5164 bytes
SHA-256: 7173ec24bfb12473a596afd5823da9b021353cfecb017d2f2e84af5376d16ee5
font_01_sfnt_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10960 bytes
SHA-256: 417d63fbbf26cc680bbff45b9fae9a77016aec6f4e36e1ffbc401abe87082b95

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