Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4589dc02bc5571…

MALICIOUS

PDF

78.5 KB Created: 2020-12-25 10:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 41c4a90a5f01ad269f9ed3acece5e004 SHA-1: 35f63d541089dc4b49833d03dbf922e9fbeb0eaf SHA-256: af4589dc02bc5571793717aef1cfaa65c643fd4ab2e4c3ea35f70b7800cd9f23
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 high risk score. It contains an external URI pointing to a suspicious domain, likely intended to host a phishing page or further malware. The document body, though heavily obfuscated, contains keywords related to a medical condition, suggesting a lure to attract victims.

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://traffset.ru/aws?utm_term=arnold+chiari+malformation+hereditary PDF link annotation
    • https://cdn.sqhk.co/purovufizu/ggihicg/dotumokamugewomowawarila.pdfIn PDF document text
    • https://cdn.sqhk.co/rafatuvolix/lMxHif5/anime_avatar_maker_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/9jihjgj/57380523023.pdfIn PDF document text
    • https://cdn.sqhk.co/buwepexe/ihc9nih/97279579870.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/iiUagic/welixigizojamugatusavativ.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/libowebujakux/gst_tax_rate_slab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9debc165-b14c-49e5-beba-6f6c1b2acb33/47954296954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbe28e2-3a2a-4a61-a8c6-7d62ca44a57f/tadafenujunelufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d7d504-68c7-43b4-963b-bd8c81dc881e/gimib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2931982b-ee27-4d71-9c81-27341b072ff1/the_goophered_grapevine_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe7e985-4f72-4286-a036-d1d8edc1b6c1/chemical_building_blocks_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a01ae8-3a2d-4e1e-affd-296ff4612e1b/strange_way_to_save_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3702e424-4cbb-4a12-8a3e-b5b899ca175a/klotz_octane_booster_mmt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601ec502-095c-4942-85b9-43758eb90605/xatazesakegemu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 4960 bytes
SHA-256: 472862e1cb3cc25356cfff932a725e2a37051f229e9749fd2e9b6e62b1ae7168
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 11884 bytes
SHA-256: 1344c2d5c00c4c99ba6d752f3d3e6c6f5a20fbcc6ae775a87b41b9f29788aaf3
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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