Malicious PDF — malware analysis report

Static analysis result for SHA-256 153232ee94c7fbd1…

MALICIOUS

PDF

87.0 KB Created: 2021-02-16 21:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cce5ac3f63f5603282e797cdaecafb7a SHA-1: b5fd362947fa4fb96d7b88fc315690f748146f19 SHA-256: 153232ee94c7fbd189a57bde68d39cf470b9c1451180da4f75e3108a114e9575
134 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to its creation, and the overall structure points towards a lure designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=relion+2+second+thermometer+battery+size PDF link annotation
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/xukepi.pdfIn PDF document text
    • http://livecopyrightverification.com/o_amante_marguerite_duras_download5959u.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/2386712.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/ultimate_motorcycle_simulatorifacf.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/eRhaDMa/44398889146.pdfIn PDF document text
    • http://dukipor.iblogger.org/wulanofom.pdfIn PDF document text
    • http://covid-19online.site/rixujilikenuran1u0s9.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/233414757596mxae.pdfIn PDF document text
    • http://eeeeeyyy.space/wordly_wise_3000_student_logint0jb2.pdfIn PDF document text
    • https://zexonozanefamiw.weebly.com/uploads/1/3/1/1/131163740/9852833.pdfIn PDF document text
    • http://gromstroy.com/248501970fei0f.pdfIn PDF document text
    • http://maximizator.space/77141035647eeckj.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/dd97cf.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/c5IAihR/wumisefewad.pdfIn PDF document text
    • http://vostokzapad.su/65847620078u0ipm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revuzulikasulo.epizy.com/algebra_substitution_worksheets_year_8.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/13736655233.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/baixar_netflix_para_android_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/4631710325.pdfIn PDF document text
    • http://negikapivipen.epizy.com/android_mobile_below_3000_4g.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_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 5612 bytes
SHA-256: 0b57dadbf8aafa5705ec67175cb34ce17cc726a79306a79dbe829867384d5217
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 12020 bytes
SHA-256: b396cd83783968a46bed3db192a1853f1ae5f2084f2f83b10e22ffbf1bbb0ec0

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