Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81defc7eb86b6c4…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 18:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39c3657cf1de1843c459374d8adedbb4 SHA-1: e50b20d037d639e49c04f3958ee62170fa94c7bd SHA-256: f81defc7eb86b6c4cf6aad1a8f2fdb2e2a1b87b36d737d54b06c200cfe48ec9a
96 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically referencing a "chemistry density lab answer key" to entice users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of numerous suspicious URLs suggests the document is designed to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/wix?keyword=chemistry+density+lab+answer+key
    • https://static.s123-cdn-static.com/uploads/4416935/normal_600606f6f1495.pdf
    • http://vereffka.xyz/jorikixoxidovw4wvj.pdf
    • https://lafivejazep.weebly.com/uploads/1/3/4/7/134771341/17890.pdf
    • http://chambreop.xyz/65240642478l9nx9.pdf
    • http://winoraama.fun/vipilebaxefobugc3vxv.pdf
    • http://iblack.space/durapuruzutavws539.pdf
    • http://testertumentum.space/mijogekoxikuvabed9rfa6.pdf
    • http://svoytrylend.xyz/pirilegkqkb3.pdf
    • http://milanbeachs.space/excel_sheet_for_expenses_and_income_monthlyp9le3.pdf
    • https://powufaru.weebly.com/uploads/1/3/5/3/135310655/5281385.pdf
    • http://differencecheats.net/66553500702i5tg9.pdf
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/125630.pdf
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/4633096.pdf
    • https://cdn-cms.f-static.net/uploads/4454426/normal_60170cd0a386a.pdf
    • http://helplnstagramcontact6088756.com/tozokubiwobewivuvadudiduvrj.pdf
    • http://websporizle3.com/82686952521i1pbt.pdf
    • http://prizinsta365.website/how_often_do_you_change_a_kinetico_water_filter6t5ab.pdf
    • http://prod-fruit.space/8480709284v9b1u.pdf
    • http://new-volosi.ru/96675539448jry1z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d28505ec-9a49-4542-b0b4-93d6c8a82d0b/blade_and_soul_patch_error.pdf
    • https://uploads.strikinglycdn.com/files/894bf51e-d75a-4714-bfdd-19d2e9b1ca20/court_of_thorns_and_roses_series_amazon.pdf
    • https://uploads.strikinglycdn.com/files/f60408f0-1103-4621-8198-18a6336906b9/bruce_lee_tamil_songs_download_320kbps.pdf
    • https://uploads.strikinglycdn.com/files/4202dfb9-cfe3-43e5-928b-f454ae6f9fba/ansul_r_102_installation_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23c.bin
e429c997b4884cb01b916e1d6317beb9656940f6bcc4700f8573966b6c6b566e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 5368 bytes
font_01_sfnt_off0001045f.bin
e86a657e85f5264a13ae57688457c5b7947d8dba4ebb6fef867645e0bcd8c22c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 10640 bytes

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