Malicious PDF — malware analysis report

Static analysis result for SHA-256 1def657290843b00…

MALICIOUS

PDF

83.3 KB Created: 2021-03-07 19:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 033cea07e6f060db0d7571fbe4ada3c0 SHA-1: 8080bbba0ba6f6a50badfdeb35cfe5921d1b95fb SHA-256: 1def657290843b00e1f295713fcb8d72732effc168a7823699b97aafed6e5448
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious sites. The embedded content, while appearing as a simple question, is likely a lure to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/strik?utm_term=cuanto+vale+2.5+metros+en+pulgadas PDF link annotation
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/ronuzip.pdfIn PDF document text
    • http://zesijesagevonot.22web.org/cadette_uniform.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/3400399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_60274e0d6c346.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/zeburimutilu-tijoxifed-zawukubine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_602b0bb97bfec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_601fef1135fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fe6e91c5eb00.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/bnyTKTF/fomovevetevujijomobupoko.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/iejjjei/dc_bike_ride_2019_photos.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/bimemevizo.pdfIn PDF document text
    • https://rujusuxiledajo.weebly.com/uploads/1/3/4/8/134861970/8015033.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/bXYYve0/41812082390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5fcfb00493c09.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/kghdknv/wuwudigotebapalevomu.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_1f1abcf101d24deaae1ee57857f6b458.pdf?index=trueIn PDF document text
    • http://pazatirademe.rf.gd/diferencia_entre_materia_y_energia_ejemplos.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_d090e27c45454a83bad89d6db0258d74.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_ca359ff1260344b59e11e7b2a651d352.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_5931d73188014c509289e4d2f75ceea4.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_bd6d03fcf6ee4f8d8c4fe9400ec1a568.pdf?index=trueIn PDF document text
    • http://worurekebisur.rf.gd/addition_compensation_strategy_worksheets.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_7c8fc8516a5048d199174446f2133b4e.pdf?index=trueIn PDF document text
    • https://ad1ab7a2-fed4-4f9a-b892-868933c94317.filesusr.com/ugd/b914b5_2a1c42064c5745b2a04890ef693362db.pdf?index=trueIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f280.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF280 12824 bytes
SHA-256: 30d1514d93bde21ca729844ece7dd204ef69db5fab8517b8559301ef4106c6d3
font_00_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 5532 bytes
SHA-256: b569ee9c11fa5725690ff07daff3f6bb65066da993196e8870c6884166531f80
font_02_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 11700 bytes
SHA-256: 93ec1bf549fb453d00131ce4b768599a98edb8ccdf0107554d1cd92e9d17550d

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