Malicious PDF — malware analysis report

Static analysis result for SHA-256 64aec5132408b2da…

MALICIOUS

PDF

70.5 KB Created: 2021-03-03 13:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f73408082de7444aaeef25b22f82691a SHA-1: 9a3cfd9c1662fa1ee58e7e68b99dcae9b42c1785 SHA-256: 64aec5132408b2dae26a83fa824e4ddb855b648418b398d04f9e3564b6a64666
134 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm hosted on disposable domains. It contains numerous embedded URLs, many pointing to suspicious or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'times table practice printable', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=times+table+practice+printable PDF link annotation
    • http://italywow.space/ecclesiastical_deed_pollggxsu.pdfIn PDF document text
    • http://astrohelp.space/american_politics_for_beginnersg6u9k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fed5fe8de94e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5ffea13517b94.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/9175603.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/femugazipapusor.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/id8haic/98301704130.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/bitelodobopufagi.pdfIn PDF document text
    • http://abanca-electronica.com/38774701423t2bkw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_6003c81143b47.pdfIn PDF document text
    • http://reduslim-officialsite.site/mamenilupenuia7k9.pdfIn PDF document text
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/mujuwofu_lasobajabeloz_jokoxipavuxujog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_6037a40c2667b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/gajezamo.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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 5168 bytes
SHA-256: 8246f4812cd33ba80b4053498b2fecc38a9fa24c52b5a386a05dbbd5dd98c9b5
font_01_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 10748 bytes
SHA-256: 68d45b1ccfc05da2ecb5f17c05fb8912e7e65a9af8fa2e11f9dcc1988b72ef28

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