Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b950f8d2a114f3…

MALICIOUS

PDF

68.5 KB Created: 2021-01-21 10:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: afebb213e700c1a58d4b82b615c005f3 SHA-1: a377ad28a3bebf302f7c0d98fe2c78a43260824b SHA-256: 25b950f8d2a114f3f4e6f6920764f6fd3c343a3fd31890234e1ccd826536340d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a 'download button' heuristic and an embedded URL suggests a phishing or social engineering lure to trick the user into downloading a payload. The primary IOC is the external URL found within the document.

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://bologen.ru/123?utm_term=logitech+extreme+3d+pro+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fa0320821ec8.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/Kjfgeid/gem_hunt_tv_show_fake.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/hj8rThs/98196472936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5fa5b96b87dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5f9eba61f146f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_5fd9034eda780.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/fEWToEu/xinarumeme.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jckjfNf/assistant_professor_vs_professor.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/fieib9f/sub4sub_pro_mod_apk_unlimited_coins_terbaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449399/normal_5fdf01ab1b96c.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/6hewvhc/54011444363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povasapodojika.epizy.com/anna_university_caution_deposit_refund_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/ascenseur_pour_l_chafaud_miles_davis_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/bajunisikur.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_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 5564 bytes
SHA-256: a8b6dbf8552e8107d21674a7b3be3322bc624971629219942fcbf2f13d8c7035
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 12028 bytes
SHA-256: 728c96eccae8112bb776d4faac4a217d04633dfa98979b37f7e0cdfaa50a1d81

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