Malicious PDF — malware analysis report

Static analysis result for SHA-256 61360261838e2a63…

MALICIOUS

PDF

79.8 KB Created: 2021-03-14 12:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d22413321be06b5178a9592acf2573a3 SHA-1: 230a7bd0194ef376f15bd84b3464c13078dd3a7f SHA-256: 61360261838e2a63c4ce7ecf748237c43ef24e206c55bf113ef7e0431b80bf7e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting a lure to a malicious site. The document body, though heavily obfuscated, appears to be related to 'reprogramming a water softener', a common pretext for phishing. The presence of external URIs and link farm heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+reprogram+a+water+softener PDF link annotation
    • http://bepifukikuku.mygamesonline.org/736792934.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/2hdgwGB/13288911980.pdfIn PDF document text
    • http://wusujobarowi.22web.org/5345610764.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/buruvudamesaf.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/agdidgi/withings_body_review.pdfIn PDF document text
    • http://rekilafemet.iblogger.org/personal_finance_credit_basics_worksheet.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/60ca2ddf-851f-4080-8e1c-0917140a3362/machine_learning_and_ai_jobs_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/tosijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97218f6a-0786-4c7e-a9cc-1921dd276ea5/tanujodepefovimedufi.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/how_to_clean_a_hoover_windtunnel_2.pdfIn PDF document text
    • http://rawisafowusedum.rf.gd/14194303783.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/bawodiwitesazakuzuwuzop.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/fanaa_all_shayari_video_free.pdfIn PDF document text
    • http://zonisitis.rf.gd/hack_bitcoin_miner_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0f8869-de97-4d9e-beb7-e113c637aa6f/invicta_watches_gold_first_copy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a787bb-f2f2-4f89-b4d0-169196cb431c/96952765659.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/javascript_base64_to_blob.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/media_creation_tool_windows_8_free.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_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 5244 bytes
SHA-256: fe71e1aa95d64f7e4c09d6e2f37d062f70a713b1a1bf6250217cab0656afa597
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10416 bytes
SHA-256: 5a084e7453fa3fb430bede384c86405be83a09b1fbc2cf0e25880a4b9d41d694

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