Malicious PDF — malware analysis report

Static analysis result for SHA-256 587ee78ff776492f…

MALICIOUS

PDF

87.8 KB Created: 2021-04-22 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47cc07cc850f6d907437acc3e6aec5b SHA-1: 528d071e186a0ce43b542b16daa695859aee72e9 SHA-256: 587ee78ff776492fada034e77c9a2261098caa43de5a2fc1210dab77fb57f031
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. A PDF URI heuristic points to a suspicious URL, 'https://nipisod.ru/strik?utm_term=ilustraciones+para+predicar+pdf', which is likely used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nipisod.ru/strik?utm_term=ilustraciones+para+predicar+pdf
    • https://cdn-cms.f-static.net/uploads/4417645/normal_602c6ecc71c3a.pdf
    • https://static.s123-cdn-static.com/uploads/4456121/normal_6003d3bb0d613.pdf
    • http://pe50off.info/small_scale_business_in_nigeria_2020qwz5s.pdf
    • http://bluhgang.best/77716515795cw04m.pdf
    • http://reduslim-officialsite.site/whats_a_wimplezm5ic.pdf
    • http://kojazunupetip.mygamesonline.org/how_to_get_a_feral_cat_neutered.pdf
    • http://kushtanash.ru/niwifoxiwavejop2qazt.pdf
    • http://datinge.site/636925539266mnuy.pdf
    • http://gipogup.sportsontheweb.net/allen_notes_neet.pdf
    • http://dududuw.mypressonline.com/adductor_strain_rehab.pdf
    • https://cdn-cms.f-static.net/uploads/4476938/normal_601be62f91c80.pdf
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ffc1d21c9e7e.pdf
    • http://gagivukamuw.getenjoyment.net/45099221719.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vovuzize/jivuvosigesijuwek.pdf
    • https://uploads.strikinglycdn.com/files/a0e0d6d7-b518-45bb-a189-4b6df4b595ad/introduction_to_geographic_information_systems_8th_edition_free_download.pdf
    • https://uploads.strikinglycdn.com/files/efb192bc-8844-4917-b89f-5c7a06345a12/86828171284.pdf
    • https://s3.amazonaws.com/bexolamabad/asuran_trailer_video_free.pdf
    • https://uploads.strikinglycdn.com/files/69774479-2ff1-41b6-a782-5f93ed4bf2a9/jebukunikobejowitab.pdf
    • https://uploads.strikinglycdn.com/files/5d1a418a-c959-476b-bd5f-d795b4b271e7/calculus_an_intuitive_and_physical_approach_by_morris_kline.pdf
    • https://uploads.strikinglycdn.com/files/4c72cb55-0113-40b2-bcd7-4f4403d354b6/antec_900_release_date.pdf
    • https://uploads.strikinglycdn.com/files/df6fedc2-45b5-4ba8-a571-e3453441a016/boxuviwopozalugotutimexa.pdf
    • https://s3.amazonaws.com/bikikanafopavu/xudivok.pdf
    • https://uploads.strikinglycdn.com/files/78f2666c-a293-4e88-949c-2b00c7fd31ed/human_resource_management_meaning.pdf
    • https://uploads.strikinglycdn.com/files/2657de30-5230-4d1f-b3a6-3d8ad4fa2557/20346879747.pdf
    • https://uploads.strikinglycdn.com/files/3d0d11c1-048f-4563-9743-ac10efbcf46e/asp.net_mvc_tutorials_teacher.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_off00010fea.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 2900 bytes
font_01_sfnt_off00011a2c.bin
7a56c67e6caa307b1c5a368ed753c9fa75ec81b000471fc79ae0b36d4855fde4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 5088 bytes
font_02_sfnt_off00012b84.bin
4ad679f792a43cdbe3ef9b56d3dcdcf8f67e350bcdb0a1d5ed8e2ac2188d580d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 11016 bytes

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