Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9c4f821804b510…

MALICIOUS

PDF

81.7 KB Created: 2021-05-06 02:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3ff213cbdb34ad76e241d441b4f1ed74 SHA-1: 23b109cc8d8e188772014adc6a8da98ca01994ee SHA-256: 1e9c4f821804b51076c57ee82d93fb7c5d30e1c5f599f9a219fa0ea819292f71
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple invisible links, with a high-confidence heuristic identifying them as a CAPTCHA-themed lure. Several external URIs were extracted, including one pointing to a potential phishing or malware delivery site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://baarspo.ru/strik?utm_term=camp+chef+pellet+grill+parts PDF link annotation
    • http://xudisoda.66ghz.com/manual_de_impresora_sato_cl4nx.pdfIn PDF document text
    • http://gobegoxox.22web.org/geno_auriemma_contract.pdfIn PDF document text
    • http://rubonupulaboti.22web.org/annihilation_method.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/j2gcUen/gsmarena_iphone_11.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/klia8B0/steel_weight_calculator_app.pdfIn PDF document text
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/7139260.pdfIn PDF document text
    • http://tafuvomilo.22web.org/buster_captcha_solver_for_humans_android.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/nunewi.pdfIn PDF document text
    • https://cdn.sqhk.co/wepugozotap/hjhbjjZ/diablo_3_necromancer_pet_build_season_21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajetizefo.rf.gd/95863766347.pdfIn PDF document text
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_047dfe2902664beb9ebfc43f5b500f37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/sajig.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_a7126cb4fe13409faef85c9e0b0ef537.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavabi/gugomiradugu.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_f4458305034541ac8cc26fb7361cc40c.pdf?index=trueIn PDF document text
    • http://bunakakivukutus.epizy.com/ruwoliritaputozufud.pdfIn PDF document text
    • http://kizebemifovexe.rf.gd/nivasifoxisudulimid.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_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 5332 bytes
SHA-256: e2d005b52913a2477283a7ee5fc38d38a650ffd02880bd5bff035f5ee72fdcc7
font_01_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 12136 bytes
SHA-256: 292fdc8aeef8e2d33bb96d60b2e2416f69a5218c5c108fc867e649da64241820

Open this report in the interactive analyzer, or submit your own file for analysis.