Malicious PDF — malware analysis report

Static analysis result for SHA-256 4867b88a6752f378…

MALICIOUS

PDF

78.4 KB Created: 2021-04-03 07:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 839f054b5db964997239c73580667bfd SHA-1: 89ef22859b9ebba098961fb175d1f493bc4b61c5 SHA-256: 4867b88a6752f3784dac66884f525f676b40f9bbf99a0fcf0912d614f38af24e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=cisco+819+4g+router+configuration+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468837/normal_6063c9aeb5d0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fe50fd4a3bef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502268/normal_5ff69285f2a7a.pdfIn PDF document text
    • http://mofolaz.22web.org/android_mobile_3d_games_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5fcc5297d2579.pdfIn PDF document text
    • http://xerujupuje.sportsontheweb.net/wave_equation_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6026d2cf2435f.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/xukasisugebejo.pdfIn PDF document text
    • http://xukavokuboloj.iblogger.org/tecnicas_de_asepsia_y_antisepsia_quirurgica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d216002-39cc-4300-9fb5-3c700abca458/how_to_make_extra_money_on_the_side_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f75c9a0-d9c4-46d3-8b94-45f17598076e/ranomojonexisej.pdfIn PDF document text
    • http://lesodabat.epizy.com/xazamamis.pdfIn PDF document text
    • https://3d636ecf-b5c4-4691-845c-2d501a7a8090.filesusr.com/ugd/b09df1_db8100c137604930b383884c4dc87e0d.pdf?index=trueIn PDF document text
    • http://vitewunidamol.epizy.com/koxomuruwewalenado.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_c3b20832c28b4bd888fadc3f91b14325.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_18cacccfe5174c88b8184cc3e2842e09.pdf?index=trueIn PDF document text
    • http://wuxojawe.epizy.com/87684232068.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_26c4e49c29b041608f5edbf42d7322ea.pdf?index=trueIn PDF document text
    • http://xujogefup.rf.gd/afghan_food_recipes.pdfIn PDF document text
    • http://moxozejoxolisuf.epizy.com/ximogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbef5b61-568a-4e6f-a5ee-a2890fa910e1/caramel_swirl_iced_coffee_dunkin_donuts_recipe.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_d9570b3d679d40978983e7ccb9bfe69c.pdf?index=trueIn PDF document text
    • http://jizonizop.rf.gd/bionomik_nyamuk_anopheles.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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5552 bytes
SHA-256: db4be9fbbdf7bde90ae89658ae47322fce90c105cc1ef0c0842d9b21cdaf95b7
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10952 bytes
SHA-256: 0dab04932ff1741029719dcb198b42232af08af197fda007d5041a60b57d70db