Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a419b3fb81b4f0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 21:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4a4f909f0a252fa7e6c806201badbb0 SHA-1: 5a74c7e6ec8150c765e04d2f6ef40db049036609 SHA-256: 45a419b3fb81b4f03eff0a863ebc1f9c220f30511532e961008f3b70d238b4bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable. This suggests an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5926844c---19412709174.pdf In PDF document text
    • https://sabunwangi.com/contents/files/xipogogadowotegeti.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/texos.pdfIn PDF document text
    • http://pi-consulting.ch/download/tewixurulugifamojar.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/supawogifibedixetijowe.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sataxezuvobejetalazixow.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/bovalesigilux.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/76237597177.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vanexejigamed.pdfIn PDF document text
    • http://hevolta.com/upload/file/94428071582.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6cb5f1bd---49181693362.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/49509351510.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sudivesofasijin.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/jozozirajek.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/92079177859.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/neduduwasaxaniramijixawe.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/982132600.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/91045884794.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/nivirowov.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/tikopujudiko.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_75EB3EF5F0717F57.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/73466183023.pdfIn PDF document text
    • http://househouse.it/userfiles/files/rifutofatofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kindle+mod+apk+download+everything+unlockedPDF link annotation
    • 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_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 15300 bytes
SHA-256: 7fffe45a87af7c2c663ab05933f1b44562950ac0116771499c31bb8c40496ffe
font_02_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 11244 bytes
SHA-256: 20a1fa328b63b49d27c3ffc85d077930b578af6cd22cfd0595584ef771e1f1b1

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