Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c5dbe997108c80…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 13:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1d280579a0e32bc9e06f13ca1093cc0 SHA-1: 4ff3dbb88c8faa38131ba6def3f497f58986b5bb SHA-256: b3c5dbe997108c80a605b627d8ff0f0e0c096a6953e1798c2fd1c0e6e8c86b33
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The 'ML_NYX_PDF_MALICIOUS' heuristic firing with a high confidence score further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://nipisod.ru/aws?utm_term=bell+hooks+feminist+theory+from+margin+to+center+analysis
    • https://kasipuxatupar.weebly.com/uploads/1/3/5/9/135966953/6123513.pdf
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/ginalupisaninajex.pdf
    • https://cdn.sqhk.co/rutesawir/cjfgihg/bikixil.pdf
    • http://hotgirls.host/772612908343veii.pdf
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/d282fbd2f955afd.pdf
    • http://lnstagramverifiedbadgeshelpcenters.net/mechanical_engineering_jobs_seattle_washington98ywp.pdf
    • https://pawiwojofidinof.weebly.com/uploads/1/3/4/4/134458390/xofep_tilokekitime_doxena_wakelenebotumu.pdf
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/7759111.pdf
    • https://cdn.sqhk.co/nuxezitowefi/jhgUjjK/8807967224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_49d64d9014ed41148f9606b2442bc932.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_5e42f0564fbe47bf8dab4263e3013652.pdf?index=true
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_353268f505b943d2894f2f95b9e7609d.pdf?index=true
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_859ba807c2224549b4b94824e4b7c874.pdf?index=true
    • https://s3.amazonaws.com/tikofaketonub/all_photo_size_list.pdf
    • https://s3.amazonaws.com/lodazojamuva/46087445227.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_e2f82d4ef55b4cd1a3479439f36e60c5.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_1163689144064d0ca8c8459d0e1c2ac5.pdf?index=true
    • https://s3.amazonaws.com/tobobowu/renewable_and_nonrenewable_resources_quiz.pdf
    • https://s3.amazonaws.com/pisedij/graphing_cartesian_plane_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f850.bin
52b2cdfecf0194a698a5a471674406c9f48a207c09a5007c4ffa830518da3834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 5508 bytes
font_01_sfnt_off00010af1.bin
41c1f7f071ef4dfbd7a8f3817386a895c7098cc465372e2fbd4c23b848dcd325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 11432 bytes

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