Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc3169e10f92082…

MALICIOUS

PDF

75.3 KB Created: 2021-03-07 01:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c511b5a55c1e9fc31388f2b0d688fc6c SHA-1: 3437a02f4dde31bf78f0b98edbad0682d1f7d1f8 SHA-256: 5fc3169e10f92082829c8502ce4352fbd79898864cf83317deb92c00b301ce9b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to health measurements, likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=how+do+scales+measure+bone+mass PDF link annotation
    • http://shoppermarket.online/96793427870abg39.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/6434496.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/7353238.pdfIn PDF document text
    • http://mifvideo.space/xilumumaugm5l.pdfIn PDF document text
    • http://detonicufficiale.website/jemigoz8aa0.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/2473645164.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/837c19e3da1.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/maytag_bravos_washer_clear_codes.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/8699292.pdfIn PDF document text
    • http://the-job.ru/miraculous_ladybug_yoyo_wiki70lc2.pdfIn PDF document text
    • http://3-bureaureport.info/710808316974pqh9.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/39318521660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupoti/61880625556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667692e3-d6ef-48e8-b9ac-4ed6ab4e8534/zuvopobuvajovepubupoxij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e653a3f5-185f-4234-b8dd-3df68707969f/kapume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a935521-b5bf-4a37-af58-3dc8c6cfdc1e/64576362973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f034db7d-0b33-4512-956a-2d4e2adb30a5/kixanixal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e3664e-140f-48e3-b9cf-6104dceae9bb/how_do_you_handle_stress_interview_best_answer.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/53692912185.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/birogoxadadivojesosutolug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98853707-a836-4274-8004-6a4c0c30e717/53967424601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbc19dd-6362-43d5-b95a-9e5ab83bf80c/59818107721.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/look_whos_back_meme.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/sopenaziroxugifomuta.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/goodman_fielder_annual_report.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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 5276 bytes
SHA-256: 8cff927d705f8fef01ef5dbaf134a19188d1867d88b0eef51ff68c0e8c71ffaf
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10548 bytes
SHA-256: f9e01a7e0261f8fa916dd39c74693da162faa7ce1faaec842ee6aa9479b36aa0

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