Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d3f0783d1a5987…

MALICIOUS

PDF

74.9 KB Created: 2021-03-16 07:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2749db146cb8568f63761a65fd6c176f SHA-1: 99665d426ac131b8a8a717760bf8f0532f45e4a4 SHA-256: c8d3f0783d1a5987175430623da7445d5fb6936878085589e3b0ca4a66ca0e10
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a malicious domain, identified by both heuristics and a ClamAV signature as a phishing trojan. The document body, though heavily obfuscated, suggests a search result lure for 'radiografias cd juarez'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect the user to a compromised site.

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://nipisod.ru/wix?keyword=radiografias+cd+juarez
    • https://cdn.sqhk.co/xezojutatow/iitnjgh/name_for_kikar_tree.pdf
    • http://nibobokil.66ghz.com/vugewisox.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_603372f232200.pdf
    • http://newberginvestmentproperty.com/31014344557ix2ka.pdf
    • http://save50it.pro/manual_de_gramatica_6th_editionaigrl.pdf
    • https://cdn.sqhk.co/pixefavenar/e2Mcwig/74170891556.pdf
    • https://static.s123-cdn-static.com/uploads/4462073/normal_5fca72944a662.pdf
    • http://uscarins.info/14056263410q74i1.pdf
    • https://cdn.sqhk.co/duvetezoje/cheJqjh/tolidixafuradubekupud.pdf
    • https://cdn.sqhk.co/mujowofapubi/igzlbgs/ship_tycoon_ios_tips.pdf
    • http://fragcups.com/51826442868w4mw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jasadavebaga/mukunobedirevenemof.pdf
    • http://lerezebov.epizy.com/283191807.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/samsung_rf4267hars_xaa_water_filter.pdf
    • https://s3.amazonaws.com/niporofez/chick_fil_a_breakfast_menu.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/10560856315.pdf
    • https://s3.amazonaws.com/nopomewegobij/brightness_control_driver.pdf
    • https://s3.amazonaws.com/jitimesolagun/computer_all_parts_name_and_full_form.pdf
    • http://zuwopun.rf.gd/hp_designjet_500_price.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e315.bin
aefdd87d36bcb5dafad4d3ae40d2f5cf050f74d6f376acc4f98c1eacb56b7498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 5288 bytes
font_01_sfnt_off0000f539.bin
e6a502693b220b22047f195d0f9032e246bfd539296f04545211b20cd2a10c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 12152 bytes

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