Malicious PDF — malware analysis report

Static analysis result for SHA-256 137d755be85f7612…

MALICIOUS

PDF

98.1 KB Created: 2021-05-21 03:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7e73584553f4b94abd3330495ef15f13 SHA-1: b119f256736000f8adecd5d746d14494bae079b0 SHA-256: 137d755be85f761218b4611cd986becb52b4d08fecbcba24d1f885675dae5171
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, characteristic of a link farm designed to manipulate search engine results. The primary URL, https://maypoin.ru/strik?utm_term=sindhu+bhairavi+serial+episodes, is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://maypoin.ru/strik?utm_term=sindhu+bhairavi+serial+episodes PDF link annotation
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/58a4270a.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/4299365.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/4198109.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/223724.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/783c3e9.pdfIn PDF document text
    • https://gudozegibuxof.weebly.com/uploads/1/3/4/7/134732985/bikuzumefom_zupomuxabunuj_depijekixupudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/ruger_lcp_review_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/mefuruzozonofi.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/tumoxemotuvoxawuzew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc75d977-c070-48e0-8064-dc9ade04f84f/sura_yasin_bangla_translation_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bahamas_government_employment_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f392de0b-d57b-483d-9d9d-802a34be1517/neville_goddard_how_to_read_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e09aae-0f8e-4dcb-ab91-2ed42f480c6e/94680525842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179a16d4-64d1-40c9-9f67-02e2211ed6e9/zofap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93524d92-aaa6-4832-bb86-46535f493555/cateye_velo_5_not_showing_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d34397-31ed-449b-bec9-6afac677b508/applied_statistics_and_probability_for_engineers_7th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db397b17-d844-4f21-b3a6-fc247c52b02a/xbox_one_wireless_controller_white_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/mapedegibiw.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/how_to_provide_cognitive_behavioral_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8230986-b379-4ca8-971f-c5828ac78a2b/como_hacer_un_taller_de_animacion_a_la_lectura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0711430f-c641-4cf7-839f-2ee15fccf482/stihl_battery_weed_eater_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3d90fd-75f5-4089-a800-228ec56403f8/42462341625.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 5348 bytes
SHA-256: e6893d1d81390e16cac929d62ba629a38ac4c189eda0d8dda3e8b24cc0bd07bc
font_01_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 9356 bytes
SHA-256: 518dd15cbf36937496f1ccdd40c538c30f52ad2699488f8702659244e404fc3d
font_02_sfnt_off0001381d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 2792 bytes
SHA-256: 54c249041a45d861cfa3f98777348cab8b4fb8aa3fb141e73190fd72f59b4fa8
font_03_sfnt_off000143cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CC 12880 bytes
SHA-256: ef59e6d3a3da98560f41933105bdead2a29db5b94f6fac1142340b8c570c0719
font_04_sfnt_off00016d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D87 2676 bytes
SHA-256: 593e980a1389c1b1b8521013499c7226ea88e43346adb483803bd3209db1a02d