Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce6b824dc10b990…

MALICIOUS

PDF

74.1 KB Created: 2021-03-31 13:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a06db570208f11c08e969e8228593a94 SHA-1: eb124d64f73d9f628caa31e26883d9881cda8ee5 SHA-256: 0ce6b824dc10b990135b4d308729b66db7ad6385ef96d489d92163ffcae90f4e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URI points to 'https://zajinet.ru/award?keyword=grammar+test+pdf+a2', suggesting a lure to a phishing or malicious site. ClamAV and an ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=grammar+test+pdf+a2 PDF link annotation
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/tibizobo.pdfIn PDF document text
    • https://jasezanita.weebly.com/uploads/1/3/1/6/131637239/4348182.pdfIn PDF document text
    • http://ryursew.space/artista_notepads_la_espiral_atb5svx.pdfIn PDF document text
    • https://joriwonakogilul.weebly.com/uploads/1/3/5/3/135305945/268414da50c3.pdfIn PDF document text
    • http://copyrighthelpcentral.com/8682904337zdtxk.pdfIn PDF document text
    • http://poopo.ru/860385199416tf92.pdfIn PDF document text
    • http://tegor.xyz/fuwarugapezawixajujoagqf.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://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_d43defb3475440e7b2fbc38abd3572ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuponefi/zebikuniziwukozedeputev.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/tagalog_nursery_rhymes_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/1250013324.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_510111cfb1e444d7894f772500d33824.pdf?index=trueIn PDF document text
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_06ae128d63db4e4fa69b3089e7d3c373.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_03377f2a33bf41be8a23e807e053228a.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_0d18a70509c94aa2ba422b547946edea.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_537d99d16699496da11016c1ce52f143.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/45143551663.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_01edb01f780649e18aa7a674470703e6.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_acdbc5ad0fb74b1f873aa5d4525713f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/carlsberg_annual_report_2007.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_6d4f036edf04489886c7d60c2ad66e3f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 4840 bytes
SHA-256: 68ac0c63d95c242cb4c13e9f3d92543aa61d581c9b540f80852be4ad51b5e9c3
font_01_sfnt_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 11076 bytes
SHA-256: 8e20a7faa5fabdd1de08f014ff24e0ac0b8547f73d31d432589de8d5170a4914
font_02_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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