Malicious PDF — malware analysis report

Static analysis result for SHA-256 03acafe7255bbb8c…

MALICIOUS

PDF

79.9 KB Created: 2021-03-23 00:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 75e177614fb0d856b22fa1c06fc09aba SHA-1: 0cce34203a4e2149066aac1634f8784f33b2529b SHA-256: 03acafe7255bbb8c428d8e2d9a845f4e8d328a6ee3c5d5bf387a6c9a8824957b
186 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents, many hosted on disposable domains. The primary URL, 'https://kuzutuzo.ru/award?keyword=cengage+chemistry+books+free+download+pdf', suggests a lure for free book downloads, a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/award?keyword=cengage+chemistry+books+free+download+pdf PDF link annotation
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/faxike.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/rufasopobig.pdfIn PDF document text
    • http://rivafigikiwax.medianewsonline.com/union_budget_meaning.pdfIn PDF document text
    • http://mosquito.codes/novawofv7fk.pdfIn PDF document text
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/8ea8b639044ea.pdfIn PDF document text
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/dumiwonev_zufusuzuwoxif_zafojavofiru.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/how_do_i_get_a_religious_exemption_for_vaccines_in_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/qghwgcL/xuvujuvefukekigimo.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/98508700459.pdfIn PDF document text
    • http://axacheat4.xyz/tavonilomulexobilolofosem09kuz.pdfIn PDF document text
    • https://mawokuluser.weebly.com/uploads/1/3/5/3/135347786/104e6cd.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/jd0Rgd6/72957876479.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://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_d9425cb69a2a4923915e469ad82cc415.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_edcc7345c73543c98ea035b1979134c5.pdf?index=trueIn PDF document text
    • https://d45de9d9-8116-4232-9203-1b9506c390e4.filesusr.com/ugd/a69a10_a3b70349f24f45328eb864ae2f519d45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/corelogic_hail_reports.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/ponozag.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/lamborghini_song_feat_ragini_djpunjab.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_7d59484bb02d4d279d769044415f1d07.pdf?index=trueIn PDF document text
    • http://mifojizu.myartsonline.com/dedatanexitiwepoxig.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_a602f7f252034144b0856790c55996e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapijifas/answer_key_of_upsc_prelims_2014.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 5776 bytes
SHA-256: 1f81dbbdecb6ad4ab4ea9a1af9a5c091fdd385a049325dd4ae960508bcc94f89
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 10980 bytes
SHA-256: c870a8e03753d61d3589377d4f6028b7062018770a6379454e7eb29bbad8b8d1
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1
font_03_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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