Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85b2e5e4c0adc8f…

MALICIOUS

PDF

76.3 KB Created: 2021-02-08 16:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22e65089d97ea3d15bab890c028962d5 SHA-1: 2b0e8320080396ff8677835ac4023ee244fa1d22 SHA-256: b85b2e5e4c0adc8f173d704d5c0cc3481bbb27948714311a26ce7859d80847cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or phishing campaign. The ClamAV detection and ML classifier further indicate malicious intent. The embedded URLs, such as http://koolmaxt.online/fovolemaxodjayg3.pdf, are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://baarspo.ru/aws?utm_term=focus+imaging+centre+online+reports PDF link annotation
    • http://koolmaxt.online/fovolemaxodjayg3.pdfIn PDF document text
    • http://onlineeshop24.xyz/ley_anticorrupcion_ecuador79934.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/ccf598eaafcfa57.pdfIn PDF document text
    • http://reduslimitaly-official.site/hymns_of_praise_and_thanksgiving_with_lyrics1goxs.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/377300b.pdfIn PDF document text
    • http://tokigarodam.22web.org/uc_browser_free_windows_10.pdfIn PDF document text
    • http://lnstagram-helping.live/15106050092nbmob.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/5087595.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/3260234.pdfIn PDF document text
    • https://xizenarinirogav.weebly.com/uploads/1/3/1/4/131437147/samarajivupamub-vawikefi-dofefebijuze.pdfIn PDF document text
    • http://idealica-tufficiale.website/921736953441qtyf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupifikitove.epizy.com/manual_calefont_splendid_ionizado_13_litros.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/aaranya_kaandam_background_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/9110167976.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/opera_browser_android_tv_box.pdfIn PDF document text
    • http://zodejewab.epizy.com/betterme_weight_loss_workouts_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/barish_video_song_status.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/zakexewaxedurelik.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/solving_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/lazifumorewusoma.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/zowilej.pdfIn PDF document text
    • http://wijexir.epizy.com/relationship_between_axiology_and_education.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_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 5208 bytes
SHA-256: 0a25a3c91339518b7647f46440042d0bd2a1304fc57d1f5d32c62c02a5c76b51
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10492 bytes
SHA-256: 244b4518414687772f3dba21dee1da6c780b3cc5ab4cf626a04b0c2194d11b64

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