Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7499f0007518f4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 17:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0255aee441457b5ee65009c115ff1fcc SHA-1: c3d915cb9d68244ed5d1e462475659e56571abbf SHA-256: 4f7499f0007518f4621e44a931c520e68be3334fb6e3b4e4d0fd93c31cabaa11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many with 'utm_term' parameters, strongly suggests a phishing or link-farming attempt to redirect users to malicious sites. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=loving+war+read+online PDF link annotation
    • https://ecohort.info/userfiles/files/nuwajuba.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109141355345738.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/62265571297.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/rixezujavij.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/73802521051.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/fogaz.pdfIn PDF document text
    • http://manu-transport.com/documents/file/gosos.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/betefuzet.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/77584306100.pdfIn PDF document text
    • https://bagstyle.uz/images/file/kitawe.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/60186814500.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161486dbe04043---vekiribetemosevinaji.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/74066233862.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/52039807426.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614797ac99562---96751974237.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/57178489568.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/80996157862.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/70109188671.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/fewaxituwalekafetop.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/vudigegavufusabin.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/24285070922.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/zixodiwimadewu.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/desezabojidefefelo.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://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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 17516 bytes
SHA-256: 1de00fb4dbaa8ae9453fc5c56134e209a9a5ad9bdb39c77eed57ffefa6d26b76
font_01_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 10268 bytes
SHA-256: 9a575a72765b79a7d09734ac8e9d20e98bacae225bccc4a97ba2a49261a2d5e9
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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