Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5b21374b0a3f54…

MALICIOUS

PDF

77.0 KB Created: 2021-04-01 05:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66eb3d6ba7a3ca89d6fd0ede89e6fc5a SHA-1: d649415e2c93d3d81df1a66ce6bbcf34af1672c6 SHA-256: 2c5b21374b0a3f54d0fb43c942510afd5b900b17cd8b0114b8d4a651fbf338ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the intent to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=halloween+vocabulary+worksheet+pdf
    • https://nijomusuvul.weebly.com/uploads/1/3/4/6/134671469/sakipufo_kavojikebisu.pdf
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/5566596.pdf
    • http://jebewif.22web.org/judge_lee_ann_hill.pdf
    • http://about-fb-support.com/manual_tv_lg_49uk6300plb59dkp.pdf
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/4f497d32122.pdf
    • http://domensita.fun/parallel_structure_worksheet_chomp_chomp7oj2u.pdf
    • https://fenatinuzari.weebly.com/uploads/1/3/5/3/135314561/kusaxobokabixilolovu.pdf
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/edc348dc3ad28ea.pdf
    • https://wanezetisozol.weebly.com/uploads/1/3/4/4/134468493/449448.pdf
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/9954451.pdf
    • http://prosale.company/hayvan_iftlii_indirxdkjg.pdf
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/zabibetemadut-rukasolaribu-topipofoz.pdf
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/485313d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d272b909-a981-4d60-a0da-07e49beaa2ac/muwadoxudesoxeluv.pdf
    • https://s3.amazonaws.com/fotepopunaj/horse_racing_games_free_full_version.pdf
    • http://relumewamamit.rf.gd/kelepedobokudota.pdf
    • https://s3.amazonaws.com/tevigotu/toxizigavu.pdf
    • https://uploads.strikinglycdn.com/files/73c77a41-d318-4c8b-bda7-45551459dfb5/bosewavukebavolemotidi.pdf
    • https://uploads.strikinglycdn.com/files/0d7205a6-b02e-4c36-97df-571779b0d82a/19917677416.pdf
    • https://uploads.strikinglycdn.com/files/275d9ed7-e573-418c-8476-2eb8cf0f4fa9/zukuxavulevazesavifase.pdf
    • https://uploads.strikinglycdn.com/files/b40c8f91-187b-4b30-98c3-b016304478f0/namufap.pdf
    • https://s3.amazonaws.com/mosezavor/85943388919.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefb.bin
440cea4e4876928b0bf8295eca96a22d6143ae63f4613c87ba081429a79495a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5664 bytes
font_01_sfnt_off0001024b.bin
56da3e2ccbbe9feab0a46fefb041bba642551c84a4777bf6875f3e263d6c20aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 11148 bytes

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