Malicious PDF — malware analysis report

Static analysis result for SHA-256 850d7aabea94b137…

MALICIOUS

PDF

78.1 KB Created: 2021-01-03 17:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 78f23440232c4cedecc4343d24531f74 SHA-1: 22f6c504d475c23f0a552646978b532545ffbeea SHA-256: 850d7aabea94b137f3e8451c8c03bf0869423e0812f2959d8e9e60efb40d509f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs to a suspicious domain, identified by heuristics as an external URI and an embedded URL. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to funeral poems, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=poems+for+grandpa+funeral PDF link annotation
    • https://cdn.sqhk.co/silinetufid/ieijNlv/83032354832.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/bcWhigh/best_space_shooter_2020.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://uploads.strikinglycdn.com/files/fc637f80-2c93-4686-b8f4-56bd6b7ae035/11230362981.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/latest_android_mobiles_in_india_below_15000.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/bluestacks_pre_rooted.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/mozart_twinkle_twinkle_little_star_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/fotogix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8dbd26-54aa-4be4-986e-a6561e186d2e/poe_elementalist_ascendancy_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688cc25d-a8ca-43a8-ac69-3b6126f4cd96/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ad6cdc-56ae-468f-b44e-de362830573b/mikodobuxatipebopeso.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/zonigumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e671c0-7994-4e3f-85c0-9ecae232617d/61537120561.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/angry_neighbor_hello_from_home_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/10th_tamil_bharathi_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/xumopafin.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/69229787305.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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 5116 bytes
SHA-256: b85be12e5afee12095d1f6d6942cb039e32969d8bd2b7291e06754b4b94e1e0f
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 10052 bytes
SHA-256: 5781b9defb88b22f8d13f80cfe73c891ff97ff0bb955523f36057d8d36aa4496
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176