Malicious PDF — malware analysis report

Static analysis result for SHA-256 abff37dcd9d4fa1e…

MALICIOUS

PDF

79.2 KB Created: 2021-04-06 08:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 25f8fb5edff474ff8026a1309f202911 SHA-1: b8da4f623d8eb4eea585d4affd38afafa4a15250 SHA-256: abff37dcd9d4fa1ee4753e641bb6e1500bcbf89c30e76d545d935f45785e5504
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to 'hungry caterpillar activities pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise a malicious URL. The embedded URL `https://bologen.ru/award?keyword=hungry+caterpillar+activities+pdf` is likely the primary malicious payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=hungry+caterpillar+activities+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5fd08da425562.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/ayatul_kursi_full_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/jiOcztb/huntercraft_mod_apk_1._0._41.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/gfjdgvu/ruzafefebi.pdfIn PDF document text
    • http://rinusiwujegabu.medianewsonline.com/30197464863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_60449ccd266d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_606a8a4af2624.pdfIn PDF document text
    • http://xekalabaxuv.medianewsonline.com/70902284163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_60034f385b2bb.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/3844000687.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_1d6be251acfa4fb7bafcc3eedd236637.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/how_to_program_directv_remote_rc71_to_vizio_tv.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/old_school_bagel_cafe_tulsa_yale.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/66074544250.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_20171f2cb62a4dbd940f8980ef1f760f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/botijemixogakumewam.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_2595a439a0d140ecb32eb114ad81dfdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/ca_nasopharynx_contouring_guidelines.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/foxemelaziwokinenabi.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_101d287f2b3846c29fdc322ef2515048.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/48242430263.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 5444 bytes
SHA-256: 5d0c4c313c1eeaf91d3e891e892ebd8699312d6337ca89b0c89857332eaa9f6a
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 11124 bytes
SHA-256: 41fda083b2d40b39b6034e497c8fa2f43f7ebcbdc1a1b6b92048a3a189f4c76b

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