Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae2d99ca283cc7a…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 12:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a81ef8effff783eac54a4a469250ccfd SHA-1: c309b5c8503268984b3891bd656e097e24aa4276 SHA-256: 3ae2d99ca283cc7a9107ad3390c40579af6707706cb62185f920cefff7562f7b
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'English calligraphy learning'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/award?keyword=english+calligraphy+learning+pdf PDF link annotation
    • https://cdn.sqhk.co/nadipozow/jfA6jdj/mavegok.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/idLNWIz/modesto_zip_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_6055bad77e74c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_60190866f30e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_603f2e8da29c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_604e872d1246b.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/WUn8F3f/wwe_battlegrounds_switch.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/fosalizuzu/68415835989.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/16806545043.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_b9815df3e00d49a0ab690b2aad364316.pdf?index=trueIn PDF document text
    • http://tiwebukesa.epizy.com/7303190224.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_48473ca8b756433b8a7ee7d469e49441.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d257e1a8-c5ea-4228-be0e-51919e75f090/how_to_take_apart_graco_magnum_x7.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/how_do_i_find_out_how_many_cubic_feet_my_washer_is.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_41a6a739c2b84084b4a872405d1a3fd1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/masevewi/letter_heading_template.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/2284013128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863d822f-ea34-4a8c-b987-ead63b24b53e/wiziwaxodefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc58177-625d-422c-9fd5-aa8972582829/74581361785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb16116-d405-4fca-8d18-77109c2c74d1/nopotub.pdfIn PDF document text
    • http://xatadul.rf.gd/wahl_clipper_guard_number_12.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/arcgis_server_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baeac119-bb0c-40ef-a886-ca2da5ee7511/asus_rog_crosshair_viii_dark_hero_release_date_uk.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_df4da2627e61444799fd19158d6e3bbe.pdf?index=trueIn 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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5476 bytes
SHA-256: 9620e15e6907e26cf76582df2f1a883af3930943668d003649cc4e1b8c59c8f8
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 10820 bytes
SHA-256: d17579fc7ba24cc3945f0af3c19eb3107d08a7e7ff055e01c1098ae24f8eeacf

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