Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a8cb8cfd9aff7a…

MALICIOUS

PDF

88.9 KB Created: 2021-04-03 17:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2723042cd68c62f9d51b411e3701c730 SHA-1: 7c3c486214c15911bef6d3260004ad3ae47037c8 SHA-256: 12a8cb8cfd9aff7afe8f6fd0073ab6de76f17b1c44098fc9572b065829bd4530
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious sites, possibly disguised as legitimate documents like annual reports.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=accenture+plc+annual+report+2018 PDF link annotation
    • http://magabof.22web.org/pigajigab.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/raxisuz.pdfIn PDF document text
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/7996598.pdfIn PDF document text
    • http://jepaxikunaku.iblogger.org/gaxepukiro.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/bq-cc_17_sba3.pdfIn PDF document text
    • http://logawedulukudan.mywebcommunity.org/2144153664.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/2c6c8dba4e.pdfIn PDF document text
    • http://fosikukiwa.iblogger.org/catequesis_para_nios_temas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pegawatovejugav.epizy.com/bryant_furnace_troubleshooting_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a3428d-dde1-40c4-bb7e-50e86062fdea/inteligencia_emocional_audiolibro_descargar.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_31d3e335b10f4786b80c4f44ad355464.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_03a8d344c7854e2e8f91f5277098de00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0b769c-9e65-4e4d-b7e0-7b58743892ec/xawawetosoposag.pdfIn PDF document text
    • http://nejajubuwuwo.rf.gd/66664347637.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_0f6716b275804f359132134c52792ef5.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_1ea9d1889d634944bbc14e682efd8f92.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_dca7677ebe9b4a2e832288c037d12e63.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_e3c0e037bac34e12aec7c2bcafb253e2.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_4b5e4ef22a71499f92dabf58257b5dd4.pdf?index=trueIn PDF document text
    • http://sabixukavizom.myartsonline.com/method_of_teaching_business_subject.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_2dd4321eae314531b733f346c4a02771.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca232a3-8ef9-44ea-bc2c-85ad1fbd7407/how_to_install_netgear_n300_wireless_usb_adapter_without_cd.pdfIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_d387c2aa7e3f4a1ea0f8daa040150636.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_442f3ccf2f414b3faaef3fe51689b5fb.pdf?index=trueIn PDF document text
    • http://zotubune.myartsonline.com/what_are_the_ages_of_kohlbergs_stages_of_moral_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d547a4-0b77-475d-9fd3-25f4fd067ee3/79934757125.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_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 5256 bytes
SHA-256: 075612c7329861be69fcd65420300cd81e7c3cf394010175df3c37ca8db4bb8e
font_01_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 11968 bytes
SHA-256: 6506ff5b3be27f4b87e7be12346f0e2b59e678e0b49903540b915f7f89ab76f0