Malicious PDF — malware analysis report

Static analysis result for SHA-256 234c03d1839b1f43…

MALICIOUS

PDF

67.5 KB Created: 2021-02-07 13:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b03eab7400ca1f7ff570bd5f71f97874 SHA-1: 7866ed36ecb6cb3b907b202342c0fa961620e0e2 SHA-256: 234c03d1839b1f43a144b6d589ee288b076916d59b76e009ad3363461bbbefad
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to link farm domains like druttle.ru and weebly.com, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wb?keyword=odia%20bhajan%20gana%20video PDF link annotation
    • https://cdn.sqhk.co/mezigiduze/4VJW9Wa/fortnite_galaxy_skin_s9.pdfIn PDF document text
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/bipemusomadasa-guzopuki-lizarinobopuzot-sunepudigajo.pdfIn PDF document text
    • http://zomusip.iblogger.org/17878155407.pdfIn PDF document text
    • https://rixafivi.weebly.com/uploads/1/3/1/3/131380000/kosepusajibigex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satuja/ibm_i2_analyst_notebook_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/41153833277.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/first_law_of_thermodynamics_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/11173921701.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/bedsheet_design_names.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/12392310384.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/avast_free_antivirus_bagas31.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/dixedajaxatuvugolaxabifu.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/tisulevudukenisetivogexas.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/1224214660.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/cbs_fantasy_football_cheat_sheet_non_ppr.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 4792 bytes
SHA-256: a2af480ae1c08710eca75e02745511de3e44a0ddba7f4ffa157772b805302041
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 9560 bytes
SHA-256: 37b3a68bfde0c3de16f87ca04a9dbd54e72fad6f4e30c908f7adde2bcba8e09b
font_02_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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