Malicious PDF — malware analysis report

Static analysis result for SHA-256 77121e3919e2bfc2…

MALICIOUS

PDF

71.2 KB Created: 2020-12-04 14:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24c4cf4641b531d5742af33d1caba65e SHA-1: 70d88cdfdbe050ada9db50a0c1f2f657cc36c0a6 SHA-256: 77121e3919e2bfc2368a038510dfca231208c26ccc817a0c5d35fc941dd4fe31
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=apk+dl+safe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6dc10746-39c1-486b-a3df-3fcce5f7b1f9/domurag.pdf
    • https://s3.amazonaws.com/xukanomarexumu/lumujoxobonolet.pdf
    • https://static1.squarespace.com/static/5fbfd6e2c6d96458361c2338/t/5fc228b2a97599144e4005f2/1606559922750/kufaz.pdf
    • https://s3.amazonaws.com/pokorevalaxex/zilawifulolur.pdf
    • https://s3.amazonaws.com/mejifavo/caesars_scheduling_portal.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb0fc7afe470b5565990/1606220559699/squad_leader_tournament.pdf
    • https://uploads.strikinglycdn.com/files/baa0465e-7865-418d-857a-bbb2b7e3abad/samsung_led_6100_series_smart_tv_manual.pdf
    • https://static1.squarespace.com/static/5fc3a23e7848ba205d29b2a8/t/5fc73c3048d5672cfb3b1b34/1606892595142/kadod.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/free_printable_colouring_sheets_of_unicorns.pdf
    • https://uploads.strikinglycdn.com/files/e7198437-7d24-4a77-b45b-c13dcb58c459/cub_cadet_pto_belt_diagram.pdf
    • https://s3.amazonaws.com/jamokaroxoj/81682027418.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d069.bin
154fd757e18203507c48a7c8a70aa61ae061b6904f3833072f37515512e64245		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 4436 bytes
font_01_sfnt_off0000df87.bin
ba539eac8e31f3fbcb6bedfa9844340f967668ccf84a6a1eaea2ce9be54f2108		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 10328 bytes
font_02_sfnt_off000102c5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 4324 bytes

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