Malicious PDF — malware analysis report

Static analysis result for SHA-256 508d742887195104…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 02:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e7e9d08b65b6f1ec90aaf556d8143f4c SHA-1: de1beb5386196181aa1812b03680d5276f3b9903 SHA-256: 508d742887195104419adf193c4512dd0d8cb261c3b71763c2bdad20565660a4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The presence of a 'download button' heuristic and an external URI suggests the document is designed to trick the user into downloading a secondary payload. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=brockport+class+schedule+worksheet PDF link annotation
    • http://fetedeju.mygamesonline.org/adobe_online_editor.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/speak_business_english_like_an_american_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/cjfVggI/57306178150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_601e6fb9e0f52.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/60667767445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5ffc714b3d1c7.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/samsung_xpress_c460fw_driver.pdfIn PDF document text
    • http://spainsale.pro/manual_reloj_casio_5208_espaolsltn7.pdfIn PDF document text
    • http://musc-media.xyz/troy_bilt_pony_riding_lawn_mower_troubleshootingtfs2p.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/oibRGjh/46597786725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/how_to_find_your_medicaid_provider_id_number.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/st_bede_s_school_redhill_uniform.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/bewexukonoxulavem.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_e4c0af4e95734b7b9fbfe9c381a091f4.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_c10294f9bd2448ed8999ec2a875d9855.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/25535027918.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/83258043067.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_f36dd02662a64f96a8418b9c039965d1.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5368 bytes
SHA-256: 5d100a1a3ad2eb9099c35a225a64922c81d1c3cccc853990af875d3ba8cb66e8
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10908 bytes
SHA-256: 9d0f5112e2a0f9321fc6b85dfac124f4ff65795c02b7c70be6d9907382974b18

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