Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7c903f232d3987…

MALICIOUS

PDF

87.5 KB Created: 2021-04-15 13:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f008c5a95550d19ab507dabf2f012015 SHA-1: 387c22b39890aa3bd62265fa68a305dd9ec30211 SHA-256: ae7c903f232d3987b7008b41bbd5d06543ed5a8fbbb1c1982797b0a7ecf26c4f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or SEO spamming operation. The primary malicious URL is disguised as a search result for an academic topic, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=what+are+the+three+intermolecular+forces+from+strongest+to+weakest PDF link annotation
    • https://kinijenu.weebly.com/uploads/1/3/4/6/134641264/7024159.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/alpha_and_omega_lyrics.pdfIn PDF document text
    • http://poguzozod.sportsontheweb.net/simple_punctuation_exercises.pdfIn PDF document text
    • https://midumusifefo.weebly.com/uploads/1/3/5/4/135401272/7823691.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/somolizajerixi.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/wuwewubezususoxatitovo.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/agile_development_tutorial.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/kiran_bank_po_english_book_download.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/keravuxodum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waduzirader/can_you_print_1099_forms_from_quickbooks.pdfIn PDF document text
    • http://lufevexos.atwebpages.com/jukatodazefasutewajifo.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/cds_2_2019_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/ropinulatogonenunuwe.pdfIn PDF document text
    • http://diwadakerinepix.myartsonline.com/4520086232.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_d972d440d994430b9e5046163b42bbf7.pdf?index=trueIn PDF document text
    • http://biwosagamivi.myartsonline.com/intex_krystal_clear_1500_gph_sand_filter_pump__saltwater_system.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/puzugoduxixajozupa.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/ponujufemebob.pdfIn PDF document text
    • http://dubanexotokegel.myartsonline.com/37602852603.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_3e781640aaca45dcb7167ce8f97304dc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 5464 bytes
SHA-256: bb09ea3d48398da7b616c78bb8e40016812fb94fc7a41f8dce21eccfb79394fb
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 11744 bytes
SHA-256: 32b78b71767976878778a6e7954911a416ec80f38a9b5d96617631ce18a8d210
font_02_sfnt_off000138ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BA 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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