Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62b1b3cf98749f7…

MALICIOUS

PDF

93.0 KB Created: 2021-03-30 14:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15d5593226e5cd9605fc9147dcf9aa12 SHA-1: 708c67e344bf77530448843f1fe3d8441c3055f4 SHA-256: a62b1b3cf98749f704857172384735acbec9843ab27d60f10521a6487828f048
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a visual download button lure and embedded URLs pointing to PDF files suggests a phishing attempt designed to trick users into downloading further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, potentially related to the document's generation or disguise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=how+to+manually+update+kindle
    • http://kifopelidito.mypressonline.com/dugarefu.pdf
    • https://cdn.sqhk.co/tajiwikiter/ehgkKii/vujoxenozibatibuledave.pdf
    • https://cdn.sqhk.co/busumodofu/hSgfmhg/73233916385.pdf
    • https://cdn-cms.f-static.net/uploads/4417669/normal_6031bc240e149.pdf
    • https://cdn.sqhk.co/vovewotutal/TNupheX/tofamabufafejaxinasasax.pdf
    • http://datab.vip/zujovubibovokogerifozotagim0ny.pdf
    • http://1-bog.ru/rubinebeva22rfl.pdf
    • http://savineme.mywebcommunity.org/daxevijarufojepimedazi.pdf
    • https://cdn-cms.f-static.net/uploads/4423427/normal_60311a94f0c55.pdf
    • http://kieverts.xyz/korg_electribe_ea-1_mk2yp585.pdf
    • http://jivusibofonefud.mygamesonline.org/broken_vessels_hillsong_lyrics.pdf
    • http://limezage.scienceontheweb.net/hydraulic_robotic_arm.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6049cbb0eb266.pdf
    • http://boguzimaro.getenjoyment.net/66910929069.pdf
    • https://cdn.sqhk.co/pagupuxu/egdVahe/76097325852.pdf
    • http://tomandbxof.site/what_are_the_ingredients_for_fettuccine_alfredo_sauceeoyf6.pdf
    • https://cdn.sqhk.co/mizipudi/bOiiuhe/super_max_the_champion_apk.pdf
    • http://jiwabozaxexe.mypressonline.com/embriologia_del_aparato_reproductor_masculino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sevoga/40055541831.pdf
    • https://s3.amazonaws.com/divelatoxa/30_second_emotional_song_video.pdf
    • http://rosevasejila.myartsonline.com/the_book_of_yes_free.pdf
    • https://s3.amazonaws.com/xufaxoferugod/27263911912.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_off00012b93.bin
a3e0908dd438757c4b6b9268e75fac801042d62d28ae09274f284b59cca0342f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 5052 bytes
font_01_sfnt_off00013cc5.bin
9cc4e720274ad93f058590316dcee5a68be0e24a1a68b376e83876268742d3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 12016 bytes

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