Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f4f75d6fa8b549…

MALICIOUS

PDF

120.6 KB Created: 2021-03-12 13:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f4196729f9b09bb6952959f8c91ef19 SHA-1: b10ea7b83148f09c10c212d76765f9da6a246a23 SHA-256: 33f4f75d6fa8b5498230bd9f2c02746510fa6f19471a1507eb4cf9dc693dc7ef
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with one identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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=deductive+and+inductive+approaches+pdf PDF link annotation
    • http://mimamiva.iblogger.org/avery_labels_template_5266.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/muwaxib_dadenilizate_xokosavifupes_gofibefeguvanu.pdfIn PDF document text
    • https://tesajezu.weebly.com/uploads/1/3/1/4/131452821/2948094.pdfIn PDF document text
    • http://ketorebagibof.22web.org/valokafadofij.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/wonumafubij/will_there_be_a_season_2_of_the_witcher_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/australian_tv_guide_queensland.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_9a5b42444b6b49278658189c5d89623f.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_62316a83d6604415a2f75c0183d3bd0a.pdf?index=trueIn PDF document text
    • http://gasededal.epizy.com/26112055875.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/69462069514.pdfIn PDF document text
    • http://jiguluvosasibun.epizy.com/37384502837.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/affidavit_of_service_format.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_2e6379e664064e41a797ab41401137ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/41944948054.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/kesivupisowupufasosiloj.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/word_rhymes_paris.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_371e7d17b2c1467f8e3c0b448cb1b95a.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_1297e3505ed9439abf5483819ff62b4c.pdf?index=trueIn PDF document text
    • http://selifesupenikiv.epizy.com/goodwill_impairment_test_reporting_unit.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/64232909115.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/depevogazaki.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/20709618333.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/fly_eagles_fly_sheet_music.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_off00018cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CDC 5152 bytes
SHA-256: 58ee819f312951aaf5295229c24d8d43aef38413980c3c8c978ac90dc52a1e36
font_01_sfnt_off00019e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E58 12024 bytes
SHA-256: 5b808f92db1b48d0c3203e094e15e67d21d31784d14f8239ffe0aa8d7c93a860
font_02_sfnt_off0001c619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C619 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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