Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a31c1331f36b9c6…

MALICIOUS

PDF

81.5 KB Created: 2021-06-01 16:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 938e4b270482c35ccf2d9dd34b4ad222 SHA-1: e4e9752fa8a23b235f558dc296e75d0674239f15 SHA-256: 6a31c1331f36b9c61f5b8945776c08d2b649e34a810b26a6f9f6e4588a3e94dd
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to redirect users. The primary URL, 'https://pistant.ru/pbw?utm_term=vertex+vx-150+programming+software+download', indicates a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://pistant.ru/pbw?utm_term=vertex+vx-150+programming+software+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393356/normal_6057f4308ecd2.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/8039935.pdfIn PDF document text
    • https://migamusuzugu.weebly.com/uploads/1/3/4/6/134657386/1562fb81d3.pdfIn PDF document text
    • https://xovamiwif.weebly.com/uploads/1/3/4/0/134096018/rinikidakajelakake.pdfIn PDF document text
    • https://malozesa.weebly.com/uploads/1/3/4/5/134505473/c86f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fe6411d7fff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_602830fe108b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5ffc1ddfc1b65.pdfIn PDF document text
    • https://tiseparalav.weebly.com/uploads/1/3/4/7/134735838/rinezuwalejana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd6439d214e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paderukut.pbworks.com/f/how_to_adjust_accelerator_pedal_position_sensor.pdfIn PDF document text
    • http://venatulafiz.pbworks.com/f/xukegasegovoxigojin.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144443130/la_ilaha_illa_anta_subhanaka_inni_kuntu_minaz_zalimin_images.pdfIn PDF document text
    • http://podixarutib.pbworks.com/w/file/fetch/144451119/vudesopi.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/2005_yamaha_fjr1300_service_manual.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/98469972767.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426225/dakifufabalanutudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6efffc-5aae-4680-b8f7-25bdd3ff9e36/spektrum_dx5e_bind_plug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfebbcef-bf87-4272-97e3-882058934f6c/lord_i_need_you_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cb2a9b-4355-4c29-a23b-849d2ee50ae5/salvando_al_soldado_perez_pelicula_completa_online_gratis.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/pros_and_cons_of_tax_relief.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/gijapafikesefatomi.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_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 5896 bytes
SHA-256: cc4709ebb229685b7de044e2e68045b687c7589a5d59e98c496c153d3b83f26c
font_01_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 11160 bytes
SHA-256: 6f4f1db4e63bbc4056bb413ecbc53480c156a114ddb5079a355b51ecbc183459

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