Malicious PDF — malware analysis report

Static analysis result for SHA-256 4831cc3255fe03a4…

MALICIOUS

PDF

79.7 KB Created: 2021-02-28 14:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 39feb5ca08b019ced8f2192d7c5da033 SHA-1: 3327d37fc9ab062ca154b014160e7fa43e7202dd SHA-256: 4831cc3255fe03a4e5a10387caf12b60aec8bce216baeed1ececdf554ade9534
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'charcoal drawings' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=how+to+keep+charcoal+drawings PDF link annotation
    • http://smilex.club/2400487473518wzh.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/what_do_self-knowledge_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_600ada6bc0a44.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/rijesenipur.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/7c55e2ae4061758.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/9a74d7ce786099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382003/normal_60009f4f38c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_600d9cd77a0c8.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/how_to_draw_beast_boy_step_by_step_easy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_601b87d57ea72.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/tokufubonof_vibowujigam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fdf46b577a23.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
    • http://bedawisanono.epizy.com/ziwazefirela.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/visetajufesoxatetubibu.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/metal_gear_solid_3_snake_eater_ign_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/venini_oven_veo64ss_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/types_of_nanomaterials.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/block_ads_on_spotify_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 5240 bytes
SHA-256: 83492107765595995e32d345e6bf17c666d6da0f1ff5742582419a2a4d0c5224
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 10240 bytes
SHA-256: 52ecc1742f7df1f56eb2944d65d42527ac9e79c1d70e477d417a0d205840c024
font_02_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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