Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48bb01b5e37c81a…

MALICIOUS

PDF

71.1 KB Created: 2021-01-12 07:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d0c87634a7c6f7a817d94a2a341daba9 SHA-1: e94a7a99e970d21f05896af8eb5f41cfeeac2e48 SHA-256: d48bb01b5e37c81a2a512257b7082c0a8320a1f4243631d46112e529f92177f6
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=aroma+multi+cooker+rice+cooker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fcd3891c31c9.pdfIn PDF document text
    • https://site-1172607.mozfiles.com/files/1172607/modern_warfare_update_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5fd5f67629da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fbedbf3829e1.pdfIn PDF document text
    • https://site-1207431.mozfiles.com/files/1207431/ikea_brimnes_nightstand_white.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/JgjHVib/bowavugiwigeresolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f86f40fc961c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_5faa3a42cbb69.pdfIn PDF document text
    • https://site-1176250.mozfiles.com/files/1176250/my_little_princess_game_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5ff8b12c5ce75.pdfIn PDF document text
    • https://site-1172757.mozfiles.com/files/1172757/24636295391.pdfIn PDF document text
    • https://site-1178549.mozfiles.com/files/1178549/setowufusugaw.pdfIn PDF document text
    • https://site-1175017.mozfiles.com/files/1175017/tojufafuvezerexozuzukaj.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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 4820 bytes
SHA-256: 4d25ce4e1558984ce6e02ce7fdebdeac3a312e08de3257a399c3f4dcc9b62998
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 10216 bytes
SHA-256: 9e4d18074a6fef94c3ec30a5df929f2eb58b7cb4aa409766b40f20429c4b5170

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