Malicious PDF — malware analysis report

Static analysis result for SHA-256 3680d141913be14f…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 14:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9ccae1f9b761421f51e196586c4beebf SHA-1: 035f9cf67be4faa41721fcebd25f8ca97dd37a93 SHA-256: 3680d141913be14f6983ec2192c40acf8e67e30379db0f9ab13471da0e7e0929
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to other PDF documents hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious. The primary function appears to be directing users to a vast network of linked content, potentially for SEO manipulation or to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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://jumiwimov.ru/123?utm_term=difference+between+denotative+and+connotative+meaning+pdf PDF link annotation
    • http://dokukuke.mypressonline.com/capital_market.pdfIn PDF document text
    • https://xonoxiti.weebly.com/uploads/1/3/4/6/134679971/gunebolegilibufotij.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/675566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5fe7a02a8814c.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/3dc6d62c91285.pdfIn PDF document text
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/4121654.pdfIn PDF document text
    • https://wolagevujizerul.weebly.com/uploads/1/3/5/3/135316080/zadenelutas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_6001e6c0bcb37.pdfIn PDF document text
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/416879.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/ludosujup.pdfIn PDF document text
    • https://larekupexog.weebly.com/uploads/1/3/4/8/134884129/26e06d502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_5fda5bd83ed80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fdeda8525cc1.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/36097295459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juborekif.atwebpages.com/gamixosefakojumilaxip.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_5dd9d73eba6c473aa41f858f4a6728ce.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_002f48cc96224ee7b53b04f545627736.pdf?index=trueIn PDF document text
    • http://pajupevezujugut.atwebpages.com/jigoxafusix.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_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 5556 bytes
SHA-256: ce04c3353bd0636aca7915a5e65f8595410a2f3bf798df1ffdb433c4cf4edcf5
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10784 bytes
SHA-256: 6d01adb146ad41439c54ff8d0cb2aa9f5d7621e6d8ea79ac892ee675af66b8d3

Open this report in the interactive analyzer, or submit your own file for analysis.