Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35a6062eab83fd4…

MALICIOUS

PDF

96.8 KB Created: 2021-03-24 14:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0dd3a61fdc730add0966e4392afb629 SHA-1: d4754c3d5f2a68736db6f10b19739a4b35f73ee4 SHA-256: b35a6062eab83fd4ff0ab7e645e3ddef9dc57d531bddc48f249ea1683353380f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDFs, many hosted on disposable domains. The primary URL, https://xajibur.ru/award?keyword=heavy+menstrual+bleeding+rcog+pdf, suggests a potential SEO manipulation or phishing lure. The presence of many external links points towards an attempt to distribute further malicious content or redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/award?keyword=heavy+menstrual+bleeding+rcog+pdf PDF link annotation
    • https://cdn.sqhk.co/soribivevi/ljggeic/76990759851.pdfIn PDF document text
    • https://gokulibom.weebly.com/uploads/1/3/4/2/134266198/49cabe763.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/ajb46IK/ny_and_company_closing_near_me.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/guvopidenorer.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/gidet.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/examples_of_critical_thinking_in_nursing_school.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/givalexijosum.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/cmTxhgr/talking_cat_sylvester_gets_a_job.pdfIn PDF document text
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/3110253.pdfIn PDF document text
    • https://gixisinada.weebly.com/uploads/1/3/0/8/130814349/gupelubosepeken.pdfIn PDF document text
    • http://mugurapit.sportsontheweb.net/agenda_2020_para_el_desarrollo_sostenible.pdfIn PDF document text
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/pikenabogaxibud_zedibawajo_saribomuliv_bopina.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/marginal_probability_density_function.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/BlighdX/furniture_mod_for_minecraft_pocket_edition_free_download.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/alphabetic_code_chart.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://s3.amazonaws.com/rojalexipokadaz/aqua_barbie_girl_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/baxituwapamab.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_3448becabb614a3d854a27c8527448f5.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_bf199774144a49d5b3621d899cb7fb00.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_95a52e048d2647a580ec57d3b44eda29.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_8696b4f06bb943ce9a2779286e21dd61.pdf?index=trueIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_805e7dd560a44fce80abe0ca005c20e8.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 5620 bytes
SHA-256: 84cafc60a43e88266f03bf84f5f2be50f29096a8d016fe16f5f930635ec7f72c
font_01_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 11096 bytes
SHA-256: 62826b4235e4af6510087aed0e3aec0a450c5c1c7ea51519b72583377e9c9365
font_02_sfnt_off0001673f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1673F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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