Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fc6db8c030605b…

MALICIOUS

PDF

114.6 KB Created: 2021-03-26 10:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 657c36c621ad9a8f0466e146b70098ce SHA-1: f4984769d64191aed9ec1ca892432ef27a28e301 SHA-256: c9fc6db8c030605b318d9f9bf47ea407d82a4d1d01de027f99675394997b0076
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards techniques used for initial access and potentially further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://jumiwimov.ru/strik?utm_term=architectural+graphic+standards+12th+edition+online PDF link annotation
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/4dc6e2.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/bekobawode.pdfIn PDF document text
    • https://dotolisode.weebly.com/uploads/1/3/4/6/134616401/1102000.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/2d45aeeb.pdfIn PDF document text
    • https://tiselewo.weebly.com/uploads/1/3/1/6/131606631/16a4f0adfec20e.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/bewuxurigi.pdfIn PDF document text
    • https://fasitidepev.weebly.com/uploads/1/3/4/3/134312072/9818391.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/9646111.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/lipewijowaxojuzenew.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/lowrance_elite-7_ti2_met_active_imaging_3-in-1_transducer.pdfIn PDF document text
    • http://jaxixojuko.mypressonline.com/1321815017.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/342881.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/77728f054687ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_3e9987f3dc9f4881a7771bca3927a563.pdf?index=trueIn PDF document text
    • http://xalixonawi.atwebpages.com/dice_probability_problems_and_solutions.pdfIn PDF document text
    • http://robogotut.epizy.com/qualitative_test_for_carboxylic_acid_amide_and_ester.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_c7c813168e134f3c9d05db45a5660572.pdf?index=trueIn PDF document text
    • http://gevuwomomot.epizy.com/bsmrstu_admission_circular_2017-_18.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_99e9704a02604cb2ae20d08d04215041.pdf?index=trueIn PDF document text
    • http://moxowofabijis.epizy.com/childhood_immunization_schedule_2018_philippines.pdfIn PDF document text
    • http://nogubas.rf.gd/nedavu.pdfIn PDF document text
    • http://mogerokefo.epizy.com/autocad_software_free_for_windows_10.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_1218a86958a047cbbc9f4fb61cfee838.pdf?index=trueIn PDF document text
    • http://legofovivaxom.epizy.com/cbse_maths_book_class_10_solutions_free_download.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_c81fcdaf5e214178ba11608c8283dcca.pdf?index=trueIn PDF document text
    • http://visevagopar.onlinewebshop.net/77799267725.pdfIn PDF document text
    • http://fasajixibapa.epizy.com/alif_satar_cukup_indah.pdfIn PDF document text
    • http://dudakitulefuteg.rf.gd/25787182406.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17377 5392 bytes
SHA-256: 3667cfb8b550d6bcb16775889c1bc07cd6d6a02f61db4891512c3da250fcdf9e
font_01_sfnt_off000185c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C2 11736 bytes
SHA-256: df7381d09c4093f18dc28846d458abc16c6a34966f8286c5b0bd20cb9ad81c0d
font_02_sfnt_off0001ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD88 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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