Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf69e2bbd1fba961…

MALICIOUS

PDF

78.1 KB Created: 2021-01-14 16:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8b49d41aba04f2b9b61775f85d3df3c6 SHA-1: 827e779d6da3176a0906e051739a9d322b8269dd SHA-256: bf69e2bbd1fba96100d040a6bd9edb4edc33120a65980e5605cee715231a973f
126 Risk Score

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 a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

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://traffnew.ru/aws?utm_term=libros+apostoles+de+la+palabra+pdf PDF link annotation
    • https://site-1176519.mozfiles.com/files/1176519/85269574974.pdfIn PDF document text
    • https://site-1171498.mozfiles.com/files/1171498/70571467673.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/rupovedesijal.pdfIn PDF document text
    • https://site-1176004.mozfiles.com/files/1176004/password_codashop_pro_apk.pdfIn PDF document text
    • https://site-1168055.mozfiles.com/files/1168055/55968550447.pdfIn PDF document text
    • https://site-1175602.mozfiles.com/files/1175602/top_model_makeup_salons.pdfIn PDF document text
    • https://site-1172574.mozfiles.com/files/1172574/31080967146.pdfIn PDF document text
    • https://site-1172205.mozfiles.com/files/1172205/crossword_clue_summary_of_beliefs.pdfIn PDF document text
    • https://site-1178383.mozfiles.com/files/1178383/80815244301.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/40118687532.pdfIn PDF document text
    • https://site-1176145.mozfiles.com/files/1176145/14585702936.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/zador.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/1hfjeMl/10423369962.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/jbigjgj/jazuboruku.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/sezebepit/wikeserilazasigu.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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 5116 bytes
SHA-256: 6c46194e3ac9977b5cfe479beec2127a720ad7a21d72c5a68ebbbfa600cc4219
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 12452 bytes
SHA-256: 3a3235b68337434072afb87a52075a51d6b82d5e425e45b3fb80b07d47d70ce1

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