Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c4efcd6aefcb52…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 15:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c06d78d8581cb0ec4b2084701503899 SHA-1: c1e0e10742b8eb219628614aa3c0a6d26b4f7421 SHA-256: 45c4efcd6aefcb5261139329f1efe79d29d8322fd6eaacdcf67a66ba8ceebccc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary external URI pointing to 'https://jumiwimov.ru/strik?utm_term=meaning+of+6011+welding+rod', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the PDF as a link farm on disposable hosting.

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://jumiwimov.ru/strik?utm_term=meaning+of+6011+welding+rod PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498883/normal_5fcc0f56b6790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_6010efb6ec1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_60481a0fb726c.pdfIn PDF document text
    • http://kostlike.site/janagurolopijeneauyjs.pdfIn PDF document text
    • http://bestunew.xyz/which_is_a_good_central_idea_statementb1xql.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fcdd9eaab171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_60478cf1128c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fdc4d2cdf8fa.pdfIn PDF document text
    • http://taxoropa.iblogger.org/fusionner_fichiers_en_ligne.pdfIn PDF document text
    • http://nojuror.22web.org/fluke_115_true_rms_multimeter_manual.pdfIn PDF document text
    • http://frukt.space/xefufudigawarodowe9pu9x.pdfIn PDF document text
    • http://itanto.space/donigfpfm6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475380/normal_5ffe6d1cdcac6.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
    • http://fizijumopib.rf.gd/adhyatma_ramayanam.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/90584955189.pdfIn PDF document text
    • http://vejaxekeni.epizy.com/zasorevukunetu.pdfIn PDF document text
    • http://babevuzax.epizy.com/tokyo_itinerary_5_days.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/bareilly_ki_barfi_movie_123mkv.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/9743203446.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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 5048 bytes
SHA-256: 4f95c1a1fd5733c4828b7530f40360cce075fe1e975e956f0f767206837903c7
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 10296 bytes
SHA-256: 6f53979d5b5de187edcb23ff314306a5e4d97e91258568d8883aa5fe171cbc6e
font_02_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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