Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58ce4e446684461…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 12:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58811224ee387f3519e53c8361a8cd6f SHA-1: be3a0db09d400d7291109d12060f4e431d2423ca SHA-256: c58ce4e446684461af20299e3a8bc17358976ea1cce8ad75b5fd48725cc69609
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL and the document body, though heavily obfuscated, suggest a lure related to 'power bi interview questions'. The primary function appears to be redirecting users to a network of linked content, potentially for SEO spam or to serve malicious payloads.

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://botokaw.ru/strik?utm_term=power+bi+interview+questions+for+7+years+experience
    • http://wewofif.scienceontheweb.net/fudoferajegamewujepeb.pdf
    • http://lumogodasekepi.mypressonline.com/jenafaxobadomapat.pdf
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/nujamigokoloji.pdf
    • http://nitafibejuze.mygamesonline.org/niwinu.pdf
    • http://italywow.pro/radamufagazextmu9z.pdf
    • https://pufakifitapota.weebly.com/uploads/1/3/4/5/134581323/390d6988.pdf
    • http://dololebajug.scienceontheweb.net/speed_control_of_dc_shunt_motor_experiment.pdf
    • http://lady-bug.club/bobevanezitonusudhhas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_eae63a70256f470ebe7d08f934f8dbc1.pdf?index=true
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_d711454e4f5d488485f1ac48bac51b8b.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_03a0703d407648549d44c65eec7be60a.pdf?index=true
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_0d224a984aa34e63a7e9a0b7de96e2ec.pdf?index=true
    • http://nufiwimuzobo.onlinewebshop.net/52044982442.pdf
    • http://ferodibev.onlinewebshop.net/susabivodaludab.pdf
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_9dec54752acb478bbf107bfd289bf331.pdf?index=true
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_21a7cc5395bd404d8141f6143de03130.pdf?index=true
    • 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_off0000e79e.bin
8b143a867028e600e0192fa22ff71fadb29f8875ef34a7d06c73f3580254e8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 5644 bytes
font_01_sfnt_off0000fb16.bin
1934cecc598e2aae8af8a98347add2a358e0ed3b67d88838da9cbae0b81157c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10944 bytes

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