Malicious PDF — malware analysis report

Static analysis result for SHA-256 c056d08271d6fbee…

MALICIOUS

PDF

75.9 KB Created: 2021-02-21 18:12:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2bebece83a96fb037acd0ac0e70aa6d9 SHA-1: 05c7ad96fbb591f22636637a9f692026b084174f SHA-256: c056d08271d6fbee5aba2a6ca762224f04bfd5c5024d4e6af80989e6a46ce5c6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high probability of malicious intent. The presence of an external URI pointing to 'jacksth.ru' and a heuristic for a visual download button suggests a phishing or malware distribution lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall indicators point to a malicious PDF designed to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/aws?utm_term=logitech+z323+speaker+system+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375341/normal_60092ce348719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_602953571cffc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475380/normal_5feec6e613a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_601f23688fe4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_60242897b375e.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/s7ihehb/9510097191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_601b38b73d966.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383678/normal_5fe50c9614671.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/mogipegi/brother_sammy_worship_audio_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/48841567425.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/yahoo_mail_android_app_change_password.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/bulujif.pdfIn PDF document text
    • http://podifugugak.epizy.com/how_to_pair_lg_soundbar_and_sub.pdfIn PDF document text
    • http://xezepagonozaniw.epizy.com/fewixoduwuxaxeri.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/34848078557.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/full_form_of_atma_in_agriculture.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/93327344006.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_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 5800 bytes
SHA-256: 1e0e9678b1f7c93f99bd6b496c31ce4eac8906c09b219253113313292309118e
font_01_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 11680 bytes
SHA-256: 97c17cfbfc04c053231e9a3c1e45519a9ab8983887a8448b0a9429846ddd237d

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