Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ecba139884019c…

MALICIOUS

PDF

64.4 KB Created: 2021-05-20 04:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e6cf9125cfaaeae51224136ad4cecc54 SHA-1: 78ec9d1ad552120eac72cb9bb7cd23001e4a168c SHA-256: f8ecba139884019c2121eb0fc606b5580df2ec186f52ef46bb8417ce7bb2759d
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to 'mezovuduw.ru', suggesting a phishing or scam attempt to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

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=how+to+get+free+spoof+credits PDF link annotation
    • https://lutapusudifo.weebly.com/uploads/1/3/1/0/131070527/5129ec.pdfIn PDF document text
    • https://xedutorapul.weebly.com/uploads/1/3/0/8/130813372/5073654.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/bijezevelimejusajox.pdfIn PDF document text
    • https://posoxunek.weebly.com/uploads/1/3/4/4/134460252/38b545b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d54271-9caa-44a1-b330-041280d92423/lixabofopifagup.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/free_symmetry_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/botulism_merck_vet_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f235a29a-efb6-4c8c-9508-5b15034d79f8/introduction_to_accounting_class_11_ts_grewal.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/adf_anti_deep_freeze_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ba99d8-4c7b-4a31-a397-05bde365417d/pupoxonijesososikexo.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/25670240211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f434f80-2685-428d-9e99-941760792e9d/64300193978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93aca83-f9a1-4fba-bdac-89ee03c0acaa/what_does_color_orange_mean_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e553417e-4280-4ee9-9ae3-9778e4303dcd/my_haier_ac_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5617f6ae-c2d3-48a9-82f0-207460fdc567/kixafuvakabolumetis.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_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 5136 bytes
SHA-256: 5dc90b3c8ae5b3b066ed956d93bbb33fce5a02ff1aa2479253cc830cf35c9ecf
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 10204 bytes
SHA-256: cfacd967e3145ea3436216c02bb5f8c9c46e61f6113322b0973ae40e7338f0ae

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