Malicious PDF — malware analysis report

Static analysis result for SHA-256 9899c8645ac9c661…

MALICIOUS

PDF

74.6 KB Created: 2021-04-11 06:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6bd398cbf0f999e0269c1df3de25816e SHA-1: 51a0388a837eb0f1539c4886ef25f8b8eca86ee0 SHA-256: 9899c8645ac9c6613ee27a1482657af60858181bcda7a323e5733a9765104cc2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=text+bubble+png+transparent PDF link annotation
    • https://wulelosen.weebly.com/uploads/1/3/5/9/135992808/gizoxamisinebutuv.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/sirobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_6052e3fe90642.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/5734459.pdfIn PDF document text
    • https://mokakabatedi.weebly.com/uploads/1/3/5/3/135300589/kimuzefuzabejeworibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465386/normal_5ffe0dc401939.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/5113889.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://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_779e4da613f24b2787aa9ca510910421.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/harry_potter_quizzes_buzzfeed_hard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d97e988-8ed8-4491-94d6-7eaccd8b318a/mawubizesufifagivutoraxuv.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_a6ecbe613d9945ae99ecf48384cd9bbb.pdf?index=trueIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_f4c85c8011004b62b487d788f08d1de1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/format_xml_in_visual_studio_code_mac.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_4a9bc5eef5254efbabfe4818ce6a6ee0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxulija/febisosetogodikexopivu.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/todera.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/fajupilupuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe714523-0eba-4dcf-b6a1-53ee75d92a88/specific_heat_worksheet_honors_chemistry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/guided_reading_activity_11-_2_world_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f0245d-4211-401f-a24d-a69ce0cf6c64/what_juice_is_good_to_reduce_blood_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/kukuwokutivulesexibonopan.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/jsdoc_template_language.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/nizilevepoxekine.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 4868 bytes
SHA-256: e5774e1ed4c8561cb1211e3ce0e733322ced5858328407ce035d6843d1f8ba74
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 1728 bytes
SHA-256: 0810ce0371bb48a6dbbb6c56d423a1e4bda4455f4638deeed9c91ec23a796c96
font_02_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 10188 bytes
SHA-256: 554c587aa03e1bbde4ab52e1392fed0a2fbc3f43a010d17f2ec27ace8faed8b9
font_03_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378