Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a27c3d31c9a1b6…

MALICIOUS

PDF

84.6 KB Created: 2021-03-20 14:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eecdef1930d84d4a5087ea376f7306f0 SHA-1: 971f1fdd91308f869897f752ffdf01cd92baf425 SHA-256: 27a27c3d31c9a1b68d789f251d3b7fe054489d7ec24ca60c203fd750c76ad416
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, appears to contain metadata related to PDF creation, suggesting it's a container for the malicious URL. The primary attack vector is likely spearphishing, aiming to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=function+of+breather+in+transformer+pdf
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ff337ae2f28a.pdf
    • https://static.s123-cdn-static.com/uploads/4402267/normal_5ff259e85f88c.pdf
    • http://rejemezurufoveg.mywebcommunity.org/rotational_symmetry_shapes.pdf
    • http://betawajapasex.22web.org/atmosfera_zanichelli.pdf
    • http://nizozipup.22web.org/practice_cursive_writing_worksheets_sentences.pdf
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fc5aa27ef9f7.pdf
    • https://cdn-cms.f-static.net/uploads/4416671/normal_600b3f02bd807.pdf
    • http://midesamipazizuj.scienceontheweb.net/aviation_mechanic_handbook_the_aviation_standard.pdf
    • https://cdn-cms.f-static.net/uploads/4422877/normal_60244c16726b7.pdf
    • https://cdn-cms.f-static.net/uploads/4465390/normal_60320492be6dc.pdf
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6038929e095a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_3f507d2357e140c4862050b7f85b4499.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_ac06e20897c34515ae0b12d4f0eccc59.pdf?index=true
    • http://waraxiv.rf.gd/can_we_instagram_story_video.pdf
    • https://s3.amazonaws.com/falevi/5334998304.pdf
    • http://kejefutipetube.epizy.com/antivirus_avast_full_version.pdf
    • https://s3.amazonaws.com/zalomi/16520857420.pdf
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_75999317b240400dbcc49809ec98caf9.pdf?index=true
    • https://s3.amazonaws.com/kujesulad/at_t_cingular_flip_2_phone_manual.pdf
    • https://s3.amazonaws.com/gomakobez/61366383923.pdf
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_66a1be7339ee45f3a00faa1078fba1d0.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012932.bin
d76d018d5aaaaf3216c4e526372e6dfee13588850b2c12891f225f6ee264a521		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12932 17972 bytes
font_00_sfnt_off0000ef8f.bin
357e1a7c724a2d782e971149f3ab877da33ef67495aea7a0ed69d5d46dd264a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5460 bytes
font_01_sfnt_off000101f2.bin
b6bb4d3b59543a864fa93d73fb204c434cb087403edfe31e29fe0965be1a37b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 11904 bytes

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