Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7b5b562e782199…

MALICIOUS

PDF

78.2 KB Created: 2021-04-07 04:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c4c5062dde7e7853b279cd3e583f5943 SHA-1: 4a6581b52015d6a00fa58d7d9c32e8f32fdfbb50 SHA-256: 5a7b5b562e7821993c68da5163de8ee9c7b8ca665bf003fa1c7aa073bafa2a5a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of outbound links designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/award?keyword=change+pdf+to+word PDF link annotation
    • https://pasazobunev.weebly.com/uploads/1/3/4/6/134670772/c3342153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_6013cda10a637.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/lijewixodot_numile_zinokexorebepu_diwiki.pdfIn PDF document text
    • https://jegiwagoxupida.weebly.com/uploads/1/3/1/3/131379361/1090459.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/7d3d0e6ca0306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_60007c7551368.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/gepikugejez.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/9037353.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/6a04b754a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_605ae5b7d50c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5fe452861f14c.pdfIn PDF document text
    • https://zupawifotifawe.weebly.com/uploads/1/3/4/4/134480263/satafum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_8a93eb64ce8d41ec924be83002607e5c.pdf?index=trueIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_4dfaa6e1649a45d3a0d9387a43b5615d.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_00279647eb9a4311ac2ff80baa5b0bf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/navy_reserve_exam_results_2020.pdfIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_9d2f555051ef4588b07ec5b272bfa951.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_b9b9337e26b741038438fd4b9f5ee48b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/concordancia_biblica_para_descargar_en.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/adestramento_de_ces_filhotes.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_b95e7d5dc6934d8ba356c49d26eb56c8.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_8840504838974abdb3ac5c2f91d84cac.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_26c30b53bc864c5c92d099b444d2743c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/hillsong_worship_broken_vessels_free.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 5088 bytes
SHA-256: 137bc206e212f56b9164d93f31a1eaad65aed25a08984854bd1960b7a1eac7c6
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 11272 bytes
SHA-256: f68897444d17d2a377ff2aab5137cc5e4f3e90bda9f96f80b020784b2de71369

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