Malicious PDF — malware analysis report

Static analysis result for SHA-256 404c138fa3d16741…

MALICIOUS

PDF

85.1 KB Created: 2021-03-20 22:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03ebf3290d598824466b6738ad60617e SHA-1: 922154af89426513b28c5ff5203de99786da70cc SHA-256: 404c138fa3d16741e0154ff70b80c98bd9b1668b09e4e924a9ed07b3caf63ffc
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for ClamAV detection. An embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though partially obfuscated, indicate an attempt to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=fundamentals+of+english+grammar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381297/normal_6013343b3534b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_6046768a5f15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_600ed11665784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_602f15660eeff.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/16216618-6d1b-4e0d-937b-319b21456ec5/eye_of_the_beholder_twilight_zone_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b424d03a-02c7-48df-a95a-7cffc4f534d4/geissele_aimpoint_pro_mount_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccfd0d3-f05b-46c1-a334-52e9afd5106d/how_to_reset_tp_link_mr3020.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/ice_cream_cone_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657ad8f9-bbaf-438a-bcb1-2cdbe88548e1/woletuxifetufoxivovumap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62dfb75-b64a-44f3-87a4-45f3e83b3b93/bulking_meal_plan_delivery.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/57362449399.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/android_bottom_sheet_fragment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f20123f-5414-4049-bc99-72d191d634b9/22514600678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7429fb37-7f1f-43ec-aa4f-2398894c6b85/99081010806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481c70d6-b5b2-4a29-95e3-fbfedb9837fc/jetotaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c69c03-b53d-4092-b243-39fdf3125e20/mivibakakerosinuxotaxani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a535c0-af3a-4a1e-ab48-600a734ad183/what_is_better_for_period_cramps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d552b009-91cf-4952-9c89-480b2bad4488/why_is_my_samsung_j7_not_connecting_to_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/abcd_full_movie_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3885544a-5d92-4167-ac69-6aa86299c589/bokepoto.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_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 5276 bytes
SHA-256: 0572990407e813d06da0fd93ff2741721e1df69e02747cc62a93b2bc24b2de2c
font_01_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 15336 bytes
SHA-256: 1e8541227140673ccc201355734a828ed9a17c57f8717164d5627b9a39c51fda

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