Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa07391b141ce279…

MALICIOUS

PDF

74.5 KB Created: 2021-02-18 23:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 68b98f9990b4c34e202238d6c7c850d3 SHA-1: ad8d3ae02ec0d78210cdcceceddd96e115ee2ede SHA-256: fa07391b141ce27900c7b0e89eb98365ca55f5dffe30763d2274fa477306938d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content, possibly as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=planet+fitness+membership+phone+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407576/normal_602ed54a9ba16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_6026c0914f582.pdfIn PDF document text
    • http://fallofelin.online/vofikigirpesem.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/2385593.pdfIn PDF document text
    • http://faceit.su/visafefifaj3nbcz.pdfIn PDF document text
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/2989084.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/3097662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498842/normal_5ff42842aab52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fd61afe057df.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/hjehdgd/countries_all_over_the_world_flags.pdfIn PDF document text
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/pefowulufajis.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/1661892.pdfIn PDF document text
    • https://lononefebodamu.weebly.com/uploads/1/3/2/6/132696526/sizete.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/Fghjfja/shareit_application_download.pdfIn PDF document text
    • https://jibukosixej.weebly.com/uploads/1/3/4/0/134018053/rudifibekisew.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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5280 bytes
SHA-256: 931c18970c72e058a2b9e06c443c8be95a789d5ff3908496309fb1941b4ad074
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10500 bytes
SHA-256: 90bb19b1501f9acb98975b0c7c07ae398de59359f66a8f9f63a57492dd4d6308

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