Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44d9a08d06f62b1…

MALICIOUS

PDF

85.5 KB Created: 2021-03-21 00:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 571a4511909a58294b2e1d713247df01 SHA-1: 96f1ef2bd0d3af93b287e07762b2a60894e4d0d1 SHA-256: a44d9a08d06f62b1193742d375a92daa52f1b581d7d18e88218129cf70aa24e1
96 Risk Score

Malware Insights

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

The file is a PDF that contains multiple embedded URLs, one of which is `https://resalured.ru/123?utm_term=abide+in+me+sermon+pdf`. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=abide+in+me+sermon+pdf
    • http://boxberry-24.cc/81326983713alcnz.pdf
    • http://bixaxivajujojar.mypressonline.com/34274252725.pdf
    • http://lesuxofozadize.mygamesonline.org/how_to_change_the_battery_in_a_dodge_grand_caravan_key_fob.pdf
    • http://mapotilij.mygamesonline.org/98393597289.pdf
    • http://wubujonil.getenjoyment.net/adenocarcinoma_pulmonar.pdf
    • http://legko.travel/gavudokosevogezebidisv9t8m.pdf
    • http://vujenixuwo.mypressonline.com/vupazunopuwugidelorolar.pdf
    • http://ufenmac.com/d_d_3._5_shackled_city95z2i.pdf
    • http://mitutepoka.medianewsonline.com/which_is_more_important_sun_moon_or_rising_sign.pdf
    • http://triple-doska1.club/83289935844e8tq6.pdf
    • http://libutulidux.medianewsonline.com/sakupedogonagexa.pdf
    • http://vizemezezu.sportsontheweb.net/fezepofekomatagovetivoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lijowavatajo.myartsonline.com/zerewubibikaka.pdf
    • https://uploads.strikinglycdn.com/files/914f904c-797f-4800-998f-8a82987e7094/what_is_the_little_prince_about.pdf
    • https://uploads.strikinglycdn.com/files/116da5e0-d854-4758-bb08-747f4c4d04cd/20161734696.pdf
    • https://uploads.strikinglycdn.com/files/cb9940e3-5e46-4f7f-b99f-18fa95282370/contrato_de_arrendamiento_vivienda_urbana_colombia_2019.pdf
    • https://s3.amazonaws.com/wutezigojuxi/bootstrap_datepicker_set_default_date_format.pdf
    • http://pazepoxi.atwebpages.com/kenmore_elite_gas_dryer_not_heating_reset_button.pdf
    • https://uploads.strikinglycdn.com/files/7b961565-5dd1-49a7-b909-4618ae9d9474/gezigatugukokilufevabux.pdf
    • https://s3.amazonaws.com/kagedatabujo/for_the_longest_time_piano_sheet_music.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_off000107bb.bin
68369aeb420769b61c0f7c47c988fe4b579670e759f247d7c424eac5445e0d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 4784 bytes
font_01_sfnt_off000117c8.bin
57250fdacf9308545250bdb033f2ac3901cd78d3613ec5d1cace8b046b2be299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 10280 bytes
font_02_sfnt_off00013ac8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 4324 bytes

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