Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb358d19cf098442…

MALICIOUS

PDF

72.2 KB Created: 2021-01-10 18:38:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 12d7c84faf1d65336c6567182c919a28 SHA-1: d4ce15098708866e54543a909c367af984e64319 SHA-256: bb358d19cf098442bf3c997d0424c211b36199a28994e6fb5775ffeb525ff0cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, suggesting a phishing or malware distribution scheme. The presence of 'Australia post envelope size guidelines' in the document body, combined with the external URI, strongly suggests a lure to trick users into clicking malicious links.

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://trafffi.ru/aws?utm_term=australia+post+envelope+size+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5feaf38386b32.pdfIn PDF document text
    • https://site-1173168.mozfiles.com/files/1173168/free_urban_books_for_iphone.pdfIn PDF document text
    • https://site-1172777.mozfiles.com/files/1172777/65808847066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5f8ea60288693.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/r7hiv6x/43835496036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5f97ca3c2ade4.pdfIn PDF document text
    • https://cdn.sqhk.co/ripudilibizo/gthbPgf/principles_of_management_notes_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/jeghhqE/sajafawijalewisoxenesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_5fb9ff25bf12c.pdfIn PDF document text
    • https://site-1173240.mozfiles.com/files/1173240/create_drop_down_list_in_excel_cell.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/Jalgfig/lego_my_city_app_store.pdfIn PDF document text
    • https://site-1178522.mozfiles.com/files/1178522/drive_by_shooting_california.pdfIn PDF document text
    • https://site-1173152.mozfiles.com/files/1173152/gopuvuxarufevusilodivezom.pdfIn PDF document text
    • https://site-1175777.mozfiles.com/files/1175777/kabesitarowusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_5fb2ebde17f21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 5224 bytes
SHA-256: d51764d4b1efafea48f6bdffab4563b13f324e2794e37686e4cddc71b59bcf37
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 11416 bytes
SHA-256: fec8354c9a9ae54f5461d48a309e13c973795a7b673b94f59846989eec26e0af

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