Malicious PDF — malware analysis report

Static analysis result for SHA-256 07913aad8ba3f528…

MALICIOUS

PDF

73.9 KB Created: 2021-05-25 03:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e85cf8b003dec2c6f5261f7f4ceee3fc SHA-1: 27c5abd7804557bdefae8ffa5b0a749378c34974 SHA-256: 07913aad8ba3f528e37e37f525444d6e1bb47f5f616c5b24c7569fa96dc264eb
104 Risk Score

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating the presence of an external URI and a visual download button lure. The embedded URL, 'https://soxebez.ru/strik?utm_term=direct+indirect+speech+rules+table+pdf', likely serves as a C2 server or a download location for a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to 'direct indirect speech rules' to entice users to click the malicious 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://soxebez.ru/strik?utm_term=direct+indirect+speech+rules+table+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fd3cc7b4f883.pdfIn PDF document text
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/7485331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_5fe937f7270e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_6056ad54eb5c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_601689c676573.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/1962137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478137/normal_5ffda7133d633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_6065b3e69aa1f.pdfIn PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/8a7e9ad24e65a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bac6e3-8318-469e-a403-e005b38a3bed/ge_dryer_timer_knob_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/mid_weight_graphic_designer_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/17742645285.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/gijuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ab4c9e-325c-496d-934c-ee8bd111e718/what_is_landscape_photography_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26c5e3d-3c17-4362-af7e-fd131a900343/liturgy_of_the_hours_guide_2021_large_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfa2d0d-9445-4af3-aa42-2d0d9b629c7f/11165065375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783a0220-6216-4e36-93df-2064fdfb82a5/how_long_do_g_shock_solar_batteries_last.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/petsafe_shock_collar_rfa-416_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/android_tv_box_remote_not_working.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_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 5384 bytes
SHA-256: 72ee40f807b5680affc88600907f554283525b55d3bae6df484c2d1d944a4233
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10248 bytes
SHA-256: bbdc3565ee0e5bd597718f2618a6b8005d76ae25c6710dfa6871541453ed71e2

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