Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd38dff59802df8b…

MALICIOUS

PDF

69.2 KB Created: 2021-02-19 08:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 62b0d5c1561fff1eec09c021417af598 SHA-1: 8a000d10d8431baac35deaf150be1083138b10f0 SHA-256: dd38dff59802df8bde8d8da1ee0cbcb1cdc4f2fcbb0ae0c7824bc733b5ffa36b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a URL that includes 'how to study for connecticut permit test', suggesting a phishing or credential harvesting lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable domains to host PDF files, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

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 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://druttle.ru/strik?utm_term=how+to+study+for+connecticut+permit+test PDF link annotation
    • http://pasozabijegigus.iblogger.org/vubuxomeginafuvema.pdfIn PDF document text
    • http://natezaka.iblogger.org/zizaxoxufebejisunoputi.pdfIn PDF document text
    • http://zatorigixoluji.iblogger.org/35228628911.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/0ac63b.pdfIn PDF document text
    • http://dadefuxafovub.22web.org/kusapuwipexubop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_600e607b22818.pdfIn PDF document text
    • https://telogedibosujo.weebly.com/uploads/1/3/1/4/131438044/f473bcd45d.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/bakefefuvojum.pdfIn PDF document text
    • http://fimosabu.iblogger.org/bijezejosovifor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botixegaminolol.rf.gd/swimming_goggles_lens_color_guide.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/annex_2_mifid_transaction_reporting.pdfIn PDF document text
    • http://bixogonabu.epizy.com/6697042115.pdfIn PDF document text
    • http://toramowajo.epizy.com/xanuvenifilaborofos.pdfIn PDF document text
    • http://jafufalabo.rf.gd/balance_sheet_example_vertical.pdfIn PDF document text
    • http://gapatija.epizy.com/99477670104.pdfIn PDF document text
    • http://fufinekudag.epizy.com/cateterismo_vesical_pediatrico.pdfIn PDF document text
    • http://donosusiligid.rf.gd/voweboba.pdfIn PDF document text
    • http://kipixuge.epizy.com/algorithms_and_data_structures_slides.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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 5212 bytes
SHA-256: 92a423a767681c375a4a9175c4fe3043d7e82c05d48723dcb9341fcf5129f943
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 10604 bytes
SHA-256: f9dd363843b2877d16187bc3417184303d931f7cbb060c1b00804e185f65bd09

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