Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ace4a05f2cf6c32…

MALICIOUS

PDF

67.0 KB Created: 2021-03-08 06:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 44aa74c21c88debc3b538e45fda80c43 SHA-1: 176af17195e40bd55f22e906a3b5015022004cfd SHA-256: 9ace4a05f2cf6c32129a93739f0e8e7c7cafa3e307c94c8d74f5fc6e9c96b03c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://nipisod.ru/wix?keyword=weather+hourly+chicago PDF link annotation
    • https://cdn.sqhk.co/budatumibowu/UHihdXa/buy_and_sell_trade_offers_nyc.pdfIn PDF document text
    • http://dimukidiri.iblogger.org/52548084187.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/g9Va3xL/google_sheet_templates_budget.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/giYrUja/rolaponagawebud.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/65239417402.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/nFjaihs/69203866886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagunum.rf.gd/informe_onu_sobre_cambio_climatico_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d309ff-c6b0-41c9-a349-bfb245d2e5f2/what_happened_to_the_glass_blower_who_inhaled_answer_key.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_2d8597e4972a462e8904b6833adf311d.pdf?index=trueIn PDF document text
    • http://dixolasafu.epizy.com/baroxosezudidemegirugibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d499188e-1c65-4040-a38e-1d2f7c649d02/how_old_is_percy_jackson_in_book_1.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3ebcc736d6264cd692775e65d1419a8d.pdf?index=trueIn PDF document text
    • http://figapow.epizy.com/gofoxajug.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/bulova_marine_star_rose_gold_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5264b0f7-20c0-4a17-bcf0-f50891141d7d/raxaweriki.pdfIn PDF document text
    • http://fepadegan.epizy.com/konawolapor.pdfIn PDF document text
    • http://dodupubi.epizy.com/18382132868.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/best_novels_to_read_to_7_year_olds.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_off0000cbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 4996 bytes
SHA-256: f88f67a932148a769b5cb7cc01120c02b39ecd36368cd5b0f162fd1dddbffd2c
font_01_sfnt_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 10008 bytes
SHA-256: fb91f40e2536c27a0f0b7ae6c33ab43e4a607ddaf011dc594cafbe5794a102ba

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