Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7586a5db6a9f52…

MALICIOUS

PDF

69.1 KB Created: 2021-04-04 13:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f882c21903cd3d73a1289519de3a61e5 SHA-1: 7f48c229f8d3669eb07b7a4086dfcb790fb913f5 SHA-256: 4d7586a5db6a9f5223c2d2dba3e22056d4af8bdb8f0f71b5a5d4c5951f8fe2ab
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://mezovuduw.ru/strik?utm_term=you+will+be+alright+meaning', is flagged as unknown reputation and is likely the primary malicious destination. The presence of ClamAV detection and a high ML score further support its malicious nature, suggesting it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=you+will+be+alright+meaning PDF link annotation
    • http://temppicture.xyz/tubifuravomowuzem66o5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_6060f6f2afecc.pdfIn PDF document text
    • http://fresh-ita.space/11381872101zhysg.pdfIn PDF document text
    • http://axecheat9.xyz/5237827839151lwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_6029f2624de1c.pdfIn PDF document text
    • http://bnl-jobs.com/30013487451471q4.pdfIn PDF document text
    • http://lozaratoz.iblogger.org/dependable_god_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_917e639f7bbe42808a3148037099f860.pdf?index=trueIn PDF document text
    • http://durunorutap.epizy.com/android_bundle_arraylist_of_objects.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/breaking_news_india_vs_china.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/vagukidaripuvulipixaj.pdfIn PDF document text
    • http://wejifofodig.rf.gd/cathode_ray_tube_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/fukiluturexusuvofugita.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/filling_out_carers_allowance_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/blitzing_biology_12_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/damask_print_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/7698422602.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_fa21593d56dd4b7a81b3aebeda1e2164.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_37bddcb4a67f44b288a60efb2e7f4142.pdf?index=trueIn PDF document text
    • http://walusapo.epizy.com/jevije.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_off0000cf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 5116 bytes
SHA-256: 85269a462d2d441de81199009ac733f91cc4f8232ca3a44546eff8dd916ca199
font_01_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 10888 bytes
SHA-256: 1f9cc1b8a1e965e03228c28fae9725759dbbb422e60ac7ce64f812ab40664121

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