Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b16f185b71f2314…

MALICIOUS

PDF

75.5 KB Created: 2021-03-23 12:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e977a1f9ad693bcd001453dd6588e8b9 SHA-1: 41281f6adf2bd149f9ae0bc68d93f0d11e2a2117 SHA-256: 3b16f185b71f23149de198dd685995f82878062de6cbcc0069ac248948b932da
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The document body is heavily obfuscated, but the presence of multiple suspicious URLs suggests an attempt to redirect the user to a malicious site. The primary attack vector appears to be a phishing lure disguised as a PDF document.

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://xezojetit.ru/strik?utm_term=how+large+is+a+male+brown+bear
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/049bc2c3c.pdf
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fcf0b9ec9b73.pdf
    • https://cdn-cms.f-static.net/uploads/4501054/normal_60295b383120f.pdf
    • http://sufawevugut.mywebcommunity.org/kuselolabokogeletiruv.pdf
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/643489.pdf
    • http://tibagisuminove.sportsontheweb.net/anomalias_cromosomicas_estructurales.pdf
    • https://cdn.sqhk.co/bofozuto/yhbIhhy/sky_roller_game.pdf
    • https://cdn.sqhk.co/fapolokid/ih0dKrv/design_home_house_renovation_apk.pdf
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdf
    • http://xutefizil.getenjoyment.net/96199883949.pdf
    • http://waralolojogeta.sportsontheweb.net/39634605862.pdf
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/lagobodiwikobuwenut.pdf
    • https://static.s123-cdn-static.com/uploads/4489593/normal_5fed82469a47e.pdf
    • http://noxaduva.mypressonline.com/35514513209.pdf
    • https://cdn-cms.f-static.net/uploads/4486775/normal_600ef52c462b9.pdf
    • https://cdn-cms.f-static.net/uploads/4448558/normal_604b98436a658.pdf
    • https://lenatazuponos.weebly.com/uploads/1/3/4/8/134888684/8762343.pdf
    • https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/dalonivutenuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rirusozo/gezamipolenapikenatos.pdf
    • http://patudesaruvob.atwebpages.com/lista_de_expresiones_idiomaticas_en_ingles.pdf
    • https://s3.amazonaws.com/gumagabu/kinematics_worksheet_1_answers.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_off0000e86d.bin
a7429301db520ec054e45342da8c04c2cc4f55794dd0005168a76aedc697ed24
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 5200 bytes
font_01_sfnt_off0000fa14.bin
0d68c99a7866a1e59289f526dba4e5b3ee0bb0dd791767d847035e6adec2a39d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 11332 bytes